Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3cd8dc853b9030…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 11:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a48365e80ba533f46dad17cee69b26d9 SHA-1: a70503ed95a76248b77b0b622c1ff64d31341423 SHA-256: cf3cd8dc853b903027d30072bbe91d427f4b7e83fdad93baf1911d339436ca74
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting the document's primary purpose is to redirect users to a network of sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/award?keyword=laboratory+safety+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/fepexeguma/clwGKdJ/rixevuminev.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/connect_kyocera_printer_to_wifi.pdfIn PDF document text
    • http://baby-slings.ru/hype_x_cyl_bluetooth_speaker_manualdtm1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fd2d1f9b37b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffcf8a0af918.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/iimzhhi/xutenopad.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/2902375.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/nituf.pdfIn PDF document text
    • http://autobaff.xyz/zunefabutokurifxu0c.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/40806782567.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/6ihliiO/86012547368.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/95a6442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_7803955b802a4f7592418584bfdc4849.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_bc2c32b917ed4e71803dd65bb489fc9d.pdf?index=trueIn PDF document text
    • http://kemesuxaw.myartsonline.com/tefit.pdfIn PDF document text
    • http://gepivefukusi.atwebpages.com/nifaza.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_b6efb9d9d15b4a7887c56731dbb4a6d8.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_07de0e29347c4b76afdea95a5196c031.pdf?index=trueIn 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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 5372 bytes
SHA-256: 99e30e4694bd8dc47e104df448c8cca225f8fa7e1b069cda617d334bf83ccd2f
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10692 bytes
SHA-256: e9e673e1d2ff52ff5977905560c1b54d5f8808babc5ba0ca2714fdee1aa81059

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