Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f865c3464558a1…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 13:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba16359013321c8e69ae97eec354477e SHA-1: 53067efd330d5968454ce259b36d99ee1d6ab933 SHA-256: c7f865c3464558a1225f8b360386155f54fcd44c258fd99bb33b1a9a7409fcdc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nomylo.ru/pbw?utm_term=how+to+connect+laptop+to+hp+officejet+4500+wireless PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6055b300284c8.pdfIn PDF document text
    • https://rategojo.weebly.com/uploads/1/3/0/7/130739688/bupenanefojinaji.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/8102769.pdfIn PDF document text
    • https://bigubiforuse.weebly.com/uploads/1/3/5/3/135389938/dopife_tigaziguvolepo_guvevumefibawap_xidako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_6007efe1e5791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_603e5d340e352.pdfIn PDF document text
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/12f9619eabd06a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456165/normal_5fee71ac20595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_6052e0c0eacb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_60672edb4964d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_605efc1729a21.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/9139350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144416730/buxumarapo.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/10885215255.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/sorowurujixolomavefab.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144455067/95366988648.pdfIn PDF document text
    • http://noxixap.pbworks.com/f/gunawajonapekotapak.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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5584 bytes
SHA-256: f46a7cccd917ae72f910fbe68c61cd0bd9654f8e30f721ff1c46ca3357e32a0f
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 11496 bytes
SHA-256: 182d36a04395ec94410f5d452fd9619825fd300b91d794bc4454e4b664f2558b

Open this report in the interactive analyzer, or submit your own file for analysis.