Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04d7db5606f4835…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 14:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8680213983d898856aca51792af9f091 SHA-1: 7f88ef948053c44442cb43deec6d9318c235044b SHA-256: b04d7db5606f48358f6c310e5de595d9129b3f58d495712780b0d217fc6a94dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious external links suggests a high likelihood of distributing further malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://mezovuduw.ru/award?keyword=alcohols+phenols+and+ethers+class+12+ncert+pdf PDF link annotation
    • https://rufevefiwavanu.weebly.com/uploads/1/3/5/9/135992343/birife.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/13452c80.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/pejezarosabasoriluf.pdfIn PDF document text
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/vobobakigovereweb.pdfIn PDF document text
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/6e4e8972274c.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/waresefuxadelazu.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/1028792.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/munazebawito.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/axial_flow_pumps_and_fans.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_install_foxit_reader_printer.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/asian_history_timeline.pdfIn PDF document text
    • https://kofezewi.weebly.com/uploads/1/3/2/3/132302944/mogosatapevabiv_mowivelusolaf_zemuladawaka_bijolidanu.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/wusulo.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/what_is_the_best_hedge_trimmer_on_the_market.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/viromibukoleliw/student_absenteeism_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/xotupatetokoson.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/jutavodip.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_2c6c8c18bbfe42e5b645d6961445ca3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/13610843101.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/5979408751.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_fd9b855396674a0a8b9661f360c3ce07.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_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 5416 bytes
SHA-256: 6ecf850d595a4b213dd78a03984a228cc603c61e818e17fc2f758a35ade7c14d
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 12204 bytes
SHA-256: 85c771b3c0a214cc09a2344e3f232e1b106dfd2f47dcc7f379c13af149a0db94

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