Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a9c66ed8bc7a75…

MALICIOUS

PDF

89.0 KB Created: 2021-04-02 07:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bf65115bc22beebf74daa8c7f8d4d69b SHA-1: 58baaa01897bd5e035d45a2802227e0e7e26a78f SHA-256: 79a9c66ed8bc7a7518e81873168e1f212ef55956653155c2173b234e4eb38c29
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 0.9989

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://midufefew.ru/strik?utm_term=why+is+there+a+chinatown+in+san+francisco PDF link annotation
    • http://powerhdniy.space/how_to_write_a_chemical_equation_class_10z3h2n.pdfIn PDF document text
    • http://sofidujewa.22web.org/deep_freeze_alternative_for_linux.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/molilofav.pdfIn PDF document text
    • https://kotazadan.weebly.com/uploads/1/3/4/3/134349323/ef0ced9a681.pdfIn PDF document text
    • http://jugejemum.iblogger.org/gizikedofid.pdfIn PDF document text
    • http://otshelnik.net/4786794411399ac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_605f6094306c4.pdfIn PDF document text
    • https://bugasezafefadi.weebly.com/uploads/1/3/1/6/131637254/miludikugol_dunoxunat_tapidowosovot.pdfIn PDF document text
    • http://wepegudefagixu.iblogger.org/icelandic_sagas.pdfIn PDF document text
    • http://nigasheff.xyz/manual_de_cabala_practicad3eho.pdfIn PDF document text
    • http://kayikciakademi.com/sujupagukojakgrsn0.pdfIn PDF document text
    • http://zzzmmmmejjj.space/airtel_tv_all_channelvc8sj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_605633549e123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_60461c00b7da5.pdfIn PDF document text
    • https://zedimidobigeno.weebly.com/uploads/1/3/4/7/134721933/1020538.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/gepelasabufuvez-zizofonog-jepar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumarimemax.epizy.com/hazelden_4th_step_guide.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_55451d9d1e0549958407f010cff84966.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_e05a406c3da94003a9abb51b69adc392.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_6000bb6252c34a5f91ec757b1573d66d.pdf?index=trueIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_5387ce3cece54fe3893b353b3935fe20.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_968ba15508f442dd8c1426f9be88838d.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_2aff8e11420946f9b495ed3012145ae0.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_4b08168d837048fcb61da6bfd2150676.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_e8c6a13a874b474d8afc51579e4b45f3.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013db9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13DB9 16888 bytes
SHA-256: 6b8a8f1ee99908c72bf0ccf71ed4252fc2e97ce2e8b58bd24fc32fdae0f65875
font_00_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 5144 bytes
SHA-256: 134c3bbe7b3a50696ed3879bf096ce1d3cd6a99701f17e639bf69fd2d14d3f2e
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 11344 bytes
SHA-256: 4f80efac3c4f5db7bea57faa02cad89fba9ceb6345eefdd837730fd10d2ba2ca