Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f85eaeef75a031e…

MALICIOUS

PDF

83.0 KB Created: 2021-04-06 12:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c93d39c5abb7697fc4b2534b89af7f16 SHA-1: d54009f69f05b8a3924ef282e564a5d4e6d68ba5 SHA-256: 0f85eaeef75a031e4e32af9403a0e30c1bbb9b908f2c0479be881d4d29c6cd05
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of a callback lure heuristic further supports a phishing or scam-related purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://resalured.ru/wix?keyword=crime+in+spanish+wells+bahamas PDF link annotation
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/ba274996dbe.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/Wii7hcH/38053834994.pdfIn PDF document text
    • https://cdn.sqhk.co/gefeloxo/Kjb6Xge/drilling_hole_in_metal_sheet.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/wewif.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/3hahcR7/russian_simulator_2.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/jhijmib/konotufipugokija.pdfIn PDF document text
    • http://fakts.design/zonevibataxomitevosatopihtmry.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/iZWXsgg/ark_survival_progression_guide.pdfIn PDF document text
    • https://dizegixevovule.weebly.com/uploads/1/3/4/5/134576191/3791d4abce09fcb.pdfIn PDF document text
    • http://padlamadla.site/how_to_put_two_images_on_top_of_each_other_in_photoshop36ccm.pdfIn PDF document text
    • http://circulshtangcalip.website/detobebasexebodezazikawankr0h.pdfIn PDF document text
    • http://skidki-day.store/xiruzepojaiwocb.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/Mu0wjbJ/drum_kits_for_sale_used.pdfIn PDF document text
    • https://tulaliferejuza.weebly.com/uploads/1/3/0/7/130775137/jiludi.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/wuvaganatob.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/1jihjkJ/cilindros_hidraulicos_enerpac_catalogo.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/fhcDOhb/capital_funds_retirement.pdfIn PDF document text
    • https://jezisivakutuxek.weebly.com/uploads/1/3/4/8/134862078/4158117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/vokut.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/date_counter_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/the_witcher_3_official_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/14765367479.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 5196 bytes
SHA-256: 15598a1de5d7d56b0024f0a29019112b3509671b1c3953111dc9d70a1f5d12e3
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 11808 bytes
SHA-256: 5243bd486fdfb23bd2818cf94cd22ae27ef1416b94a19a7e83619ee37e810a94
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15