Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae4c6501b80c70b…

MALICIOUS

PDF

70.9 KB Created: 2021-03-26 12:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fa39a41d883002a95478e34788cd891 SHA-1: 74be3cdac14c4ca1cbad08692fc0c3f4031d7de5 SHA-256: cae4c6501b80c70b7ecdf0f539fb25345d069afcc65e84b7be87df45238393a3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains or subdomains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=geoculture+chapter+3+answers
    • https://cdn.sqhk.co/tedefoso/8hiMDxj/stuntman_ignition_ps3_trophies.pdf
    • https://zinimejab.weebly.com/uploads/1/3/4/6/134653802/janupesew.pdf
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/3584586.pdf
    • http://dujerewogirovok.22web.org/37088430819.pdf
    • https://pijuzuzubafewo.weebly.com/uploads/1/3/2/6/132695302/joxewunigizu_jolibo_bawuf_zefoleresojejub.pdf
    • https://cdn.sqhk.co/gabironero/iRJRjiq/67362670329.pdf
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/venavu.pdf
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/4c4c1446b.pdf
    • http://vemipujimovow.22web.org/is_twilight_eclipse_appropriate_for_a_10_year_old.pdf
    • http://larijasetejupaz.mypressonline.com/compare_and_contrast_curriculum_design_and_curriculum_development.pdf
    • https://jumojebanofoz.weebly.com/uploads/1/3/5/3/135302369/72ed4762428baf.pdf
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/3140474.pdf
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/716742.pdf
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/besiretelu_dagel_radovavuzesa_guvizo.pdf
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/fepemeduxi_paxekalon.pdf
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/muwumomupotinokemiga.pdf
    • https://cdn.sqhk.co/gejupajo/aPKZjaH/best_cowboy_boots_to_buy.pdf
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/bifilutix_zipefaponelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vobejuk.rf.gd/what_does_apa_format_stand_for.pdf
    • http://bavotuvezomevi.myartsonline.com/gipoxeroguxatexezavi.pdf
    • http://xadifoduboboriv.rf.gd/18073535975.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb6.bin
684069111e3390ff8eddf97175d1c2fd94b1684306a2ff0a7073784a7b6ffc63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 5140 bytes
font_01_sfnt_off0000df36.bin
385394fc42b4c7abb8fd67e56945cf7676b422bd33c76750806417e928fe322d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 9720 bytes
font_02_sfnt_off00010025.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 4324 bytes

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