Malicious PDF — malware analysis report

Static analysis result for SHA-256 367243dc8f2895bc…

MALICIOUS

PDF

78.7 KB Created: 2021-05-31 14:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 415876472eed9254c9db11fa0bd8d2df SHA-1: 939ca081da50c9380bafec9dd0c360212753fd86 SHA-256: 367243dc8f2895bce000af452949c06ec81aab89ea51baf6e8aa764491946990
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=best+mc+seeds+1.16.201 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5fde26f28409e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_6049e869850d7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462379/normal_60b20beea8fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_60446a32d503a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_603afc1caa94d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fcc8ba0e1e25.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/pomuzazerazem.pdfIn PDF document text
    • https://gilezetekeno.weebly.com/uploads/1/3/4/5/134596926/1070745.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/7fa3fc20dc5.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/gudopizuwirux_zugipunil.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/6554520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_5fd96214df38c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_600a49f843718.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/7457617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499334/normal_603a048d5b703.pdfIn PDF document text
    • https://vobelerevofago.weebly.com/uploads/1/3/4/5/134596527/1437105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_60180f283e68e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449973/normal_5fcfaef6cd498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_600d8cfad947d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_604d02f33ac97.pdfIn PDF document text
    • https://fesakakosirin.weebly.com/uploads/1/3/6/0/136015409/7740291.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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 5308 bytes
SHA-256: d1191dd6690570d1012a0b2db4e28b57127bd4ae06eea0683f555cf3498fd40a
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10580 bytes
SHA-256: d77c2f4432bbda386e578942ec255144427dc42158881faf9b4fe09471e901ef

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