Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2f32191ea96163…

MALICIOUS

PDF

82.7 KB Created: 2021-02-03 09:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ba5e5b17481cf524fa39709038579851 SHA-1: db4ccbf140757068473aa27235a9a98e6b1e71dc SHA-256: bc2f32191ea96163984753289694b80bc3e433bcd7fa43c2e69ba7e2ea7ea5f6
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure malicious destinations. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links points to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=dragon+book+of+essex+pdf In PDF document text
    • https://cdn.sqhk.co/lobinazema/jh1jejc/wizopotazipakufopepab.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/Vgf1giX/wujelajarajofubebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5febf64c5eb87.pdfIn PDF document text
    • https://morexenuf.weebly.com/uploads/1/3/5/3/135311883/9920982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487927/normal_5fe579059d503.pdfIn PDF document text
    • https://zawurufaxi.weebly.com/uploads/1/3/4/8/134861846/segatuj.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/bhauhbr/vuzidesa.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/viwabor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fe419111f883.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ifhejut/56100919803.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/jGSZXnn/epic_card_game_kickstarter.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/chfibs9/nail_designs_2020_coffin_short.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/jahbbjb/online_compiler_api_github.pdfIn PDF document text
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/wapililopijafef.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/c418c124db0e0.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/V9hdtjd/33757907914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5ff6c02e15e8e.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_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 5448 bytes
SHA-256: 825c5ba86987fb21857267b0822802bfca141ebd6d6796b1985c49e4b5c4bdc8
font_01_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 12144 bytes
SHA-256: d57c3570256ace38c6413da60cedad2a636ab6243ec884ad8a061edaeaa1fa8e

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