Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9144e4eb47cafbd…

MALICIOUS

PDF

78.5 KB Created: 2021-05-03 21:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 32d7d2a91dabf80961e4790d1f295c8f SHA-1: 22a256417eeffef0f5ad1e3ef707cff6a8fbb571 SHA-256: b9144e4eb47cafbd24c67f9bb6dfeae5b0b7bfca6d87effa3a374823b04425a1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=petit+nicolas+le+football PDF link annotation
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/8d3825798c.pdfIn PDF document text
    • http://lasleymarkt.ru/what_is_the_importance_of_media_information_and_technology_literacy7qada.pdfIn PDF document text
    • https://memekofonaw.weebly.com/uploads/1/3/6/0/136054412/9278387.pdfIn PDF document text
    • http://usesucre.pro/samsung_galaxy_tab_4_7_inch_caseh4uxv.pdfIn PDF document text
    • http://subbellassecret.com/215118231459nh19.pdfIn PDF document text
    • http://kupiokno.su/soren_kierkegaard_either_oraso25.pdfIn PDF document text
    • http://sellamorem.com/37682741120iur20.pdfIn PDF document text
    • https://wawisutifefot.weebly.com/uploads/1/3/0/7/130739430/383ea5.pdfIn PDF document text
    • http://sberbank.link/93852920481fjnsy.pdfIn PDF document text
    • http://my-credit.info/377120580crdh0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8b3539f7-4ae4-4084-a21f-47cce36faa1f/nizazoniguruwu.pdfIn PDF document text
    • http://narivisifan.rf.gd/15691980072.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_81be2c2903504b1a83d66e69787e5cf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18515ef-3c49-4dce-8313-b024c912f2f2/1902760730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4badd1c5-fbd7-4a53-9967-3cfe98b2b4ff/40674387610.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_5f963f20b35b42d1b4ca74ca4d22ca00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04d248e-b20c-493f-8968-f024cba02982/speed_queen_dryer_parts_list.pdfIn PDF document text
    • http://wagadepepixapu.epizy.com/zewurodo.pdfIn PDF document text
    • http://fonisojodivese.rf.gd/habitica_app_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 4708 bytes
SHA-256: a68bed9713aa027848dc48bb25b3828c6df9e3545d84a79bd4feefc7e7135ed5
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 11368 bytes
SHA-256: cd977e11f5cbfec0b1fbf816318e5fd8038bad74771159944a8cc9940a811bd8
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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