Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edbdb03a1eede37…

MALICIOUS

PDF

77.4 KB Created: 2021-06-12 12:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69efad2a39b60fa239649eb6b11540ed SHA-1: d4fa369d9612a24d39a4f442e994e0b11883645f SHA-256: 0edbdb03a1eede37e85480139fdee49be5f42afec2fc58680e650f5a20187d1f
226 Risk Score

Malware Insights

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

This PDF document is identified as a malicious advance-fee scam, likely intended to trick users into clicking embedded links. The document contains numerous external links, many pointing to disposable hosting, and one prominent URL is `https://ketchas.ru/pbw?utm_term=vip+headshot+free+fire`. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing and trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ketchas.ru/pbw?utm_term=vip+headshot+free+fire
    • https://cdn-cms.f-static.net/uploads/4470535/normal_60192c03d62ac.pdf
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5ffcfebaad87e.pdf
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/3779406.pdf
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/1a787ba5d.pdf
    • https://zesujejiviwi.weebly.com/uploads/1/3/4/7/134729849/bukuxilezap_jafigiz_tumex.pdf
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/gonevuf-silogururojuru-texikotuzun.pdf
    • https://tujigagozevako.weebly.com/uploads/1/3/4/2/134266307/kimavarigebatup-zetot.pdf
    • https://bevifosadorafot.weebly.com/uploads/1/3/1/8/131856546/janeruzakewa.pdf
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/9457525.pdf
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/wedawexe_sevoxidij.pdf
    • https://cdn-cms.f-static.net/uploads/4450046/normal_60bea7fc8dfdf.pdf
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/eb8666ca.pdf
    • https://cdn-cms.f-static.net/uploads/4450884/normal_604394fa65f69.pdf
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/fonolokogetum-gujumot-kugasubevu-xetibeke.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_6061c21a41587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jajisaparev.pbworks.com/w/file/fetch/144412299/75533067768.pdf
    • https://uploads.strikinglycdn.com/files/60d8e8c8-8d2f-4851-a2e2-2405958f9339/what_is_a_synonym_for_potential.pdf
    • http://fosirodovo.pbworks.com/f/why_is_my_maytag_dishwasher_not_draining.pdf
    • http://liguduper.pbworks.com/f/pegejugapopori.pdf
    • http://joxakuruvi.pbworks.com/w/file/fetch/144625920/why_is_my_alienware_not_turning_on.pdf
    • http://xuresasadox.pbworks.com/f/sexevavuvefobuvubitatugow.pdf
    • https://uploads.strikinglycdn.com/files/0db9ed9e-4a5c-44db-a8a8-6eef44b9dbec/doripuvup.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/145058682/git_undo_last_commit_local.pdf
    • http://foziwedugumu.pbworks.com/f/ithalil_kathai_ezhuthum_song.pdf
    • http://zufiwuz.pbworks.com/f/what_does_never_giving_up_on_you_mean.pdf
    • https://uploads.strikinglycdn.com/files/874d6056-6bbf-4cab-8797-92180b751449/fegolatumegazapadexut.pdf
    • https://uploads.strikinglycdn.com/files/c4c36af5-c244-4bf8-a2a6-94d32cb01417/zunatax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc1.bin
7ef6e129646f8893b01171253f11263a8e4da270d8a1f81239efb8e2437e18d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 5060 bytes
font_01_sfnt_off000100f7.bin
82cbcbc908ee86aa6d294704b0e1a79b35a162d81bc0e5eb248ab97765745da3
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 11648 bytes