Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d1543f4508e50e…

MALICIOUS

PDF

102.9 KB Created: 2021-06-06 20:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 056cb30e1c5c698f2e916c268889cc1b SHA-1: 3eb09af36a14bf9f4a9dc0ce634191c11a5a145b SHA-256: 14d1543f4508e50e1c0b66906e6f396797cbba819f486ccea77448655566282d
186 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the presence of many external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://inwebjor.ru/pbw?utm_term=sap+ewm+delivery+header+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467564/normal_604b24fcae284.pdfIn PDF document text
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/woxigasobadaje.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/savirer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fc83047d602d.pdfIn PDF document text
    • https://mabiredozex.weebly.com/uploads/1/3/4/4/134482212/4382272.pdfIn PDF document text
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/pesuparet.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/voperemiluz.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/poselegarodudutir.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/bda4696918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144445668/98505024075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06276a0a-cf48-471b-a037-08cf93de69c9/tumagexenerepasas.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/85898030443.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/w/file/fetch/144730452/sizenatexuluxidetojar.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/social_club_latest_version_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf46d0a-51c7-4e0d-8885-99a58df7fb99/xukogowasotogapesuvi.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144574692/do_you_need_to_isolate_shoulders.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144724317/74482437359.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/nadebuzuletiloweroreno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f039da98-d965-4dfe-8dc2-c7246150f2a4/how_to_activate_flash_player_google_chrome.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_off00015551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15551 5516 bytes
SHA-256: 750facac8b1345927cfb131b84aab61fcd2bd2299cdc6b0e34a094f59bbe7dd3
font_01_sfnt_off00016800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16800 10652 bytes
SHA-256: 4ffc82fadfbcf24e5fc950745503958acb10bb9bb21d384d1ef1615612b3ca34

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