Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf858fec1649370…

MALICIOUS

PDF

76.8 KB Created: 2021-02-10 00:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 08d690efadc81d3affa34edb33e5a000 SHA-1: 6e04f2dc439f866348669b7d77874db08180b9a7 SHA-256: dcf858fec16493702f981a7f00d5f9f745a850926c63151bb3b1518d3c12204a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. This behavior is characteristic of phishing or malware distribution campaigns, where users are lured to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://bologen.ru/123?utm_term=monopoly+board+blank+layout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478946/normal_60209a6dbce39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5ff59f21a8505.pdfIn PDF document text
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/vuwimo_puwenoxunekoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_5fde50991b638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_601dc76bea0c1.pdfIn PDF document text
    • https://xesufomoma.weebly.com/uploads/1/3/1/0/131070197/3902677.pdfIn PDF document text
    • https://sajinekud.weebly.com/uploads/1/3/5/3/135391411/5959957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_5ff0915ac08fd.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/murevux-tumujisigepabef-lesiwurufitol-todonuvasifatil.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/xunudewe.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/tupivepuwavag.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/2012430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_60159fd63c690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6015a0fac3d84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_60005b545ec27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402032/normal_5ff0b45661e6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 5088 bytes
SHA-256: d91d91dfceb4ec6bab8352370f33b84093c0e36f76e10f64decc5f112dd5d897
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 12300 bytes
SHA-256: 5a195ee7958b315c3f48f2d6e26a962a02fe391caa505ebbf9d93886e3f6c83b

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