Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eafcf9b41bb8f99…

MALICIOUS

PDF

76.0 KB Created: 2021-06-11 05:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55de8a4bad196420e146a91d0887baea SHA-1: 1c40e080409457c3675b5af6b164d921e5f23f87 SHA-256: 8eafcf9b41bb8f999a53d86f97103eb1ddf82598f1dc0a6c47c40a31f96b06ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://synerhu.ru/pbw?utm_term=download+amazon+video+apk PDF link annotation
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/wotegabu-jepoxak.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/10a90830fe02796.pdfIn PDF document text
    • https://vobelerevofago.weebly.com/uploads/1/3/4/5/134596527/xosunenamala-metawupagorudow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6016ecb9ecd62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_602a7c6cf3e7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144868176/mibezituzukot.pdfIn PDF document text
    • http://vekunadugaj.pbworks.com/w/file/fetch/145053630/reactivity_of_group_2_elements_with_water.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144496890/man_and_superman_themes.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144455733/how_to_hack_8_ball_pool_coins_and_cash_in_pakistan_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73957c1-23f0-4be0-813d-625aa84af984/xemimadexaluvipalimi.pdfIn PDF document text
    • http://gikopedawa.pbworks.com/w/file/fetch/145094115/multiplying_decimals_worksheet.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144466152/kuttymovies_net_2016_tamil_movies_download.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144603573/apush_study_guide.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/apk_mod_auto_headshot_free_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ef686a-469d-423f-ba33-8f615a1f9279/17008033096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80763dcc-15eb-4e89-bf5b-e28d422c7912/cushcraft_r7_antenna_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3bbaca-da75-47d9-af38-048d10a34420/kugomezasekidasiduwisupep.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144810300/how_long_does_it_take_to_become_a_podiatric_surgeon.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/43284841381.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144576873/muzunejiwadavav.pdfIn PDF document text
    • http://juvozato.pbworks.com/f/main_types_of_hardware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf987e6c-975f-4034-9de4-777024be7720/how_to_use_crosley_discovery_turntable.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5096 bytes
SHA-256: 3981bcd66fb5fcf08ba0cc6beb5cfc1b9e9f34cfe0752daec95af8cbe37509b2
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10864 bytes
SHA-256: c3e9df4afd1007777a7ba63ab968e9e5f577a6e95a192839b4d6bc04aed1c2a7