Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c754396ecded3fb…

MALICIOUS

PDF

78.6 KB Created: 2021-06-07 06:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5129360d05ad217610d35adf704d1580 SHA-1: db09cfaab02a37dca84afd17a1e3efdbc53be6f0 SHA-256: 2c754396ecded3fb8b34f6973e044d3e9f24b725a9bf0f71e86e503929b98815
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The presence of a 'callback phishing' heuristic indicates a potential for social engineering, aiming to trick users into calling a number for fraudulent purposes. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=seai+attic+insulation+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446151/normal_606cdafd1971c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_605f277798107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_600dd9ef7f8b4.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/3873133.pdfIn PDF document text
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/xidifawukijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_6010f38994706.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/7192076.pdfIn PDF document text
    • https://xapebetilozeze.weebly.com/uploads/1/3/0/8/130873864/lekadidezit.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/sexibudewuwoz_sasepimokobom_wobisozob_mumusejavu.pdfIn PDF document text
    • https://nowabarabowuxo.weebly.com/uploads/1/3/4/3/134319250/1568566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_6018845bc5e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fe77d50db689.pdfIn PDF document text
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/putid-xepojagarijov-mikinasu-runagud.pdfIn PDF document text
    • https://nexezosig.weebly.com/uploads/1/3/4/4/134460983/bogikekizunu-vubarimujut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fd36bfddfda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_604347276e7ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/f/costanzo_physiology_6th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019ec85d-dc42-454b-a8ac-84c02c63ef95/growth_hacker_marketing_book_review.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/28291587589.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144411396/gexibewuzudofijuxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a485ce-7c63-406a-8fa8-c5ca802c3419/vadefopufekuminokowijo.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/65449981655.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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 5116 bytes
SHA-256: 51aaad21a72fc6e71e19c446dcb83a12d25147e4fb59f89904bcfe5005c3d50b
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 11348 bytes
SHA-256: 5fe4acaae26c929f592b5166befdf1931c3cd475e3d810348c0f481e01dcafb9

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