Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdc09565c0886a2…

MALICIOUS

PDF

86.7 KB Created: 2021-03-16 23:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4d952d85fb6f979ea9556fb7fd433c8 SHA-1: 2cdb00a677acf58204a6d1a60b364ef03d88e2b8 SHA-256: bbdc09565c0886a26e0262dfe6a2e076c3bdce2d91021fc440716e7d11ff010e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://jacksth.ru/wix?keyword=moodle+embedded+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412767/normal_60257f8b91a0d.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/igihlBi/jusiwobuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/Qgigvji/lalamusetomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5ff6994936264.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/hVCMjhc/jotefi.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/J7gfhj5/rutafewitotalagupokuxup.pdfIn PDF document text
    • http://usblighter24.site/pearls_of_wisdom_for_new_parents143np.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/wenumafu.pdfIn PDF document text
    • http://copytoshka.ru/latomosopodujekerururisabkqh4.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/castrol_magnatec_diesel_10w_40_b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_604c9a9d5d08d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/35473556600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ef911e-6a59-4a1d-828e-56f90751b05a/how_much_does_medical_administrative_assistant_get_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/38808037217.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/lejigububep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45ab960-b823-4fc0-9ff3-5a77388fac6f/bivewamowire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519f9287-e54a-407d-837d-d7e0f098d5a8/lirr_huntington_train_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/gnc_pro_performance_creatine_monohydrate_5000_review.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 5208 bytes
SHA-256: 0398f84baf308dfe1ca2e54b8c0e43df49ae5dc15f3d659b6eaffe7207dc02f8
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 12160 bytes
SHA-256: cc0c9adcf99102f93c8e70550794b4c7728f7a267353a56f0c8aa411742a6ed8

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