Malicious PDF — malware analysis report

Static analysis result for SHA-256 876dd143dd6b5000…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 21:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4c0d15d1206f69aa4ca9730199dfc01 SHA-1: 153e21baa44188a8090fe0bf156122577c11deee SHA-256: 876dd143dd6b5000f529ab408e3f91b09da680886d690910e9226ddc1cd3924d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=trusteer+rapport+security+software+hsbc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5fcb20ea3c11d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_60060407c6960.pdfIn PDF document text
    • https://gevobudijopu.weebly.com/uploads/1/3/4/8/134880408/4698a4a11.pdfIn PDF document text
    • http://sugakibabusu.scienceontheweb.net/agriculture_biologique_au_maroc.pdfIn PDF document text
    • https://tobakegerikudo.weebly.com/uploads/1/3/1/4/131482881/6125639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_60110f66ab367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_600ab3fc393d5.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/xakumoguwapaber-wurifapazavuva-majezuwel.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/3569c6.pdfIn PDF document text
    • https://dolumipekino.weebly.com/uploads/1/3/4/6/134625527/9894916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5fd917bd4c0c1.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/najubu/17726076640.pdfIn PDF document text
    • http://linuxuxotarife.rf.gd/37866922754.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/how_to_read_and_understand_financial_statements.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_e0feff10c52f47d9a791333dfbe5edaf.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_102b167e368f4e3b962f858f73a7a9af.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_b46503807aae4080ae80a74505bf3ad7.pdf?index=trueIn PDF document text
    • http://nupejodolet.epizy.com/wastewater_treatment_project_report.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_e9464a85f44f45859d8e5c9aa4ab0ccb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/94559729880.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_11585c535a05409f9d877ce3b4a7738a.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 5356 bytes
SHA-256: b983425f8a29027c91eb9cdc37a8815f257fcac3fa765ab733945ce1e8f8dc30
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 11400 bytes
SHA-256: 642cb97e859e3df95f609aa80eba524f0960d506b2ecf73d391fa7f5967c4241