Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8a607386b23ef4…

MALICIOUS

PDF

65.6 KB Created: 2020-11-21 13:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 88d0a18398da03dc5463690bca289003 SHA-1: 1e956e840217a7fdf67f765aa1ac4cbad42c2902 SHA-256: 8f8a607386b23ef4bd95b175e02f92fccf779f0db26c27cbae7afc016d2dbc28
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by a large number of external links hosted on disposable domains, a technique often used to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload or redirect to a phishing site. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=michael+l.+tipsord+linkedin PDF link annotation
    • https://natuvowefuzun.weebly.com/uploads/1/3/4/5/134516005/vidapemize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fb34db47a2aa.pdfIn PDF document text
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/4545419.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/sokukaf.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/biwuvuson.pdfIn PDF document text
    • https://judixanasagik.weebly.com/uploads/1/3/4/6/134688655/5352152.pdfIn PDF document text
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/kalagigebew.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/soviwazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5fae62aa2d4ea.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/812f952889b75.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5f9f986243f26.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/a0210.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/petuzutemixuvod/94775071460.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/porimegijusufoledadogor.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_off0000c215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 5264 bytes
SHA-256: 47eb2fafa0d90330f8a871605875af3c30ef81f98d83538503623cda0fbdddf4
font_01_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 11184 bytes
SHA-256: 211fb2c5b8125ec23e387a0cba4e703f53c2be17e330e77b775b1dfea391c8bb

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