Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d72a2ef2f2e1bc2…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 20:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47365bcedd1b4a51ce25b439685f2de1 SHA-1: c94346a1e23bc6559058c6bf66302b73e3d09a53 SHA-256: 9d72a2ef2f2e1bc23a7b1126c9be5fd55e00e608d4e9f18513bd2d14447be481
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://vilenefex.ru/wix?keyword=chapter+15+the+endocrine+system+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fe86cb4615b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_603e2e168bc5b.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/kqtRCXU/w_4_tax_withholding_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/hiphdV3/jetatulukakowewerafimofaw.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/jfOgjig/28177131804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fe6abb13e52b.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/NFjdjic/chisel_and_bits_mod_1._14._4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe1cfbc54d2e.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/50747483494.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/vwLhche/las_vegas._com_hotels.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/what_is_order_in_sequence_in_oracle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_604ca66766b0a.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/c_section_recovery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_6059ca45e57cf.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/bsc_magazine_may_2020_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fc61d77d6aa0.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/vavabi/autodesk_3d_max_trial.pdfIn PDF document text
    • http://jolivawojo.rf.gd/the_lord_of_the_rings_the_fellowship_of_the_ring_chapter_3_summary.pdfIn PDF document text
    • http://tujijekaxevon.rf.gd/kekoduxisisuxexosolavobo.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/zizonaxerefuvo.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_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 5620 bytes
SHA-256: 0ceabe7ccfb9584ff9dc959bc4674912e34a1178f811aaf96a5e045ea5690345
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 10320 bytes
SHA-256: d14fbf986ec93fa149001c777885458fc01af19be06147b0b29507dd9156c5b3

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