Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0846ade00a6932f…

MALICIOUS

PDF

98.0 KB Created: 2021-05-31 19:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a9ddb57a2ff7b01e5a91bc956ef121f SHA-1: d69693807ac90eb62fc07828f6c4acc3194764e3 SHA-256: a0846ade00a6932f4d0a9764ea0061c6bc28ee07c9ef2f2a24053a051f2c1bfd
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=bhatar+sim+lodha+dj PDF link annotation
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/4239127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5ff757b1ea62b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6017c23740b0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410004/normal_60001a6206def.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/9703877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_60355b44aae03.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/ddba9ea.pdfIn PDF document text
    • https://xenusabibup.weebly.com/uploads/1/3/4/9/134901771/rofakukimere.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4477863/normal_60b3d0ed23448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144411609/68024656535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b5e6c8-229e-4c50-be08-fd9c896c921d/beer_pong_rules_one_cup_left.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e083b55-91a0-4507-81e8-98f4a40b54c4/98517395686.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/605134733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0fb9b7-ed14-494b-be64-806ffe5346a8/list_of_egyptian_symbols_and_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d6b514-02b2-4127-acf8-3c1d421b9c44/how_much_do_managers_make_at_fast_food_restaurants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc6afd2-000e-4518-9845-e9d691c3f254/vopavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30bc899-6091-4dac-b444-92c878330aa4/pigutukujirot.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/my_boy_emulator_apk_ios.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/4255913415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36614dcf-b451-4c8b-8450-23f33d1c726d/25729825640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66238c3e-326d-41e7-9e8b-d66b9b58eb22/86824630903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976ddbee-c8cc-4b64-b205-f4c9d43af490/asus_sabertooth_990fx_r3.0_drivers.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144415671/age_of_empires_3_complete_collection_steam_cd_key.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/79832252368.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144418989/easy_worship_guitar_chords_and_lyrics.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/changes_in_the_demand_and_supply_of_gasoline_worksheet_answers.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/26263625539.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 5192 bytes
SHA-256: 5025e8dbb74cc05c29e61575962bf44ded0e23669fc4389d0a25839c981f9a50
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 5580 bytes
SHA-256: b2cdb4deb4462afa5028352bc166047c866883413beec1c1a029732a11f50cd3
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 11128 bytes
SHA-256: a08ca6d43b48ae41528306492770d0ce8e1fe292d40e3032489791b5b071164c
font_03_sfnt_off00013ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_04_sfnt_off00015212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15212 12160 bytes
SHA-256: b8fd87c1f5f9aa93e6884df7781bb95cc15c160369e5dd8d74e78b36f67cec69