Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1546261b440f044…

MALICIOUS

PDF

74.3 KB Created: 2021-05-30 19:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1516c968d287dc6ac512a07ec217c13 SHA-1: 23fa64849745ec02d38ae3752751857cdefe4b54 SHA-256: a1546261b440f044158d76ba3ce13858555be5e9ca30779b7494c5287e2eb887
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. The primary URL, https://kuzutuzo.ru/strik, is likely used to direct users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ejercicios+resueltos+progresiones+geometricas+3o+eso
    • https://cdn-cms.f-static.net/uploads/4467043/normal_6066baa23af3d.pdf
    • https://jawifimubagibe.weebly.com/uploads/1/3/4/3/134310986/7666fcde5fc.pdf
    • https://dugigezulafi.weebly.com/uploads/1/3/4/8/134898894/nusekukuduxukus.pdf
    • https://static.s123-cdn-static.com/uploads/4455916/normal_60060126e71f3.pdf
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/kavez_jasezozefaguval_govoxawalibit_rajunejij.pdf
    • https://jugujepatuw.weebly.com/uploads/1/3/4/9/134900825/dbfd63897d76941.pdf
    • https://cdn-cms.f-static.net/uploads/4459805/normal_60106b9072102.pdf
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fe230429f9c0.pdf
    • https://cdn-cms.f-static.net/uploads/4450045/normal_60541b2f98192.pdf
    • https://cdn-cms.f-static.net/uploads/4478951/normal_5fd84ccba46dd.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_60290d2823acc.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_600d461479545.pdf
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/rawekumafa-zefaxaxir-bugaditumib-jubev.pdf
    • https://cdn-cms.f-static.net/uploads/4375199/normal_606b0c7e70bca.pdf
    • https://static.s123-cdn-static-d.com/uploads/4418365/normal_60b0bf5ac3b56.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_605447e254dc4.pdf
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/mumevutukurus_bugugow.pdf
    • https://static.s123-cdn-static.com/uploads/4410004/normal_60043f62e3040.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e621.bin
2f543d7c8e845ced899cdcffe8cadf354ed5ff5956b02843aae9347ed1c9fea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 5452 bytes
font_01_sfnt_off0000f8a0.bin
dec8bd9bff160e555a6b66649a2992d204c3ff2907fedb2b953d60ea245638a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10304 bytes

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