Malicious PDF — malware analysis report

Static analysis result for SHA-256 b061842861f37f3d…

MALICIOUS

PDF

74.6 KB Created: 2021-05-28 06:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c6ffa0bbff157d6378e279adeb6e9f38 SHA-1: c3bb49da59e42f0343d3a1316c1b3b66f3325bcb SHA-256: b061842861f37f3d68957215e0c52cabb7092d58c1fed3b93b443d2abe05044a
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'kuzutuzo.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=reduce+pdf+size+online+free+less+than+100kb PDF link annotation
    • https://fisofomopix.weebly.com/uploads/1/3/4/6/134603918/7167467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_6048145538d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_60385a2a4dffc.pdfIn PDF document text
    • https://nagafibujur.weebly.com/uploads/1/3/4/5/134514283/vuxod.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/19fcc7a5224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_6067ecb010490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_6048f404cbf90.pdfIn PDF document text
    • https://xafadatez.weebly.com/uploads/1/3/4/4/134478609/7160893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_605dde9aa09b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_604d25b492f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_60503f6d2e79f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4377656/normal_60b003c378081.pdfIn PDF document text
    • https://wakazezoloke.weebly.com/uploads/1/3/3/9/133999839/zerimuruga-xewurutela-zesomapojirux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bf89bc-3558-4b73-9002-9fb116c109e0/autocad_classes_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b24cbdf-66e1-43e0-a76a-1283822ef9c7/vopafagotoxavaxevurujat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c290245d-98fa-431c-a729-74d8991cae31/electrical_engineering_handbook_siemens.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5700 bytes
SHA-256: e96ad47573196792df1d38520aee662ec15eb2dfda88bd3c7964d158037ba6b0
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10888 bytes
SHA-256: d814d366d61d1fcfefc312351236688773eb34c456d23a9714cd18142818ab46

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