Malicious PDF — malware analysis report

Static analysis result for SHA-256 312805f7185063d1…

MALICIOUS

PDF

77.4 KB Created: 2021-03-03 06:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90761c0541118fc4af452ba0628b9fce SHA-1: 539c7d0025355f7242dadbb0312dd052541ce67a SHA-256: 312805f7185063d122e48891072326b1160f8a837f8c2932f0b8489caf9b1ca1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=how+to+repair+your+body+after+a+miscarriage PDF link annotation
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/7837850.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/rinnai_heater_error_12.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/rubaza.pdfIn PDF document text
    • http://afracheat5.xyz/526243464114iqjs.pdfIn PDF document text
    • http://ogranicbio.fun/sue_bryce_photographer_wikipedianvc2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600a4fbf94739.pdfIn PDF document text
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/nomifukodexedogow.pdfIn PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/8289988.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/a6cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_60395aca8d330.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/surajumizi-zideseloj.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/gowasa.pdfIn PDF document text
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/vomusoruv-xebubebagot-kazum-rosifeze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fc593f42ba1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sotivefebaxo.epizy.com/canon_sl2_user_manual.pdfIn PDF document text
    • http://zerodawoti.rf.gd/vshare_ios_5._1._1.pdfIn PDF document text
    • http://jinelod.rf.gd/kufibomekivewisovokeluz.pdfIn PDF document text
    • http://vujesidewu.rf.gd/heber_city_police_report.pdfIn PDF document text
    • http://tovezujatim.rf.gd/80041481763.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5516 bytes
SHA-256: 30fc79054547bda4ff066a72d3b8ea8f446b6b73bd4092ef19c758306b5aa52b
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 10136 bytes
SHA-256: 08ad13059c1fd7714262d4589b35ddbcc0f8e705eaeac1fc015a6449c066d74a
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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