Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3eafa3a65d4e9e…

MALICIOUS

PDF

78.7 KB Created: 2021-01-24 02:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 26a0437b1e454d1fcb9967bfef94a170 SHA-1: 736fb1bd28e736f7e08170663b62b31f95a5e11c SHA-256: cf3eafa3a65d4e9efc808fef7448cef69f56870d8b921a00d62a186b45dc5def
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious websites. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by redirecting them to potentially harmful content.

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
  • 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.
  • 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://druttle.ru/123?utm_term=girlfriend+in+a+coma+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409107/normal_5fefb2e0219fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fdf6c9304645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fef870426c2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5ffa4d362127f.pdfIn PDF document text
    • https://gomemaliji.weebly.com/uploads/1/3/4/0/134040406/fupotosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5feb95bd49467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5fdec4d01eed4.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/govami.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/383808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fd3d26dd65ef.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/66b1ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fce175c6199e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/xopimufuluban.pdfIn PDF document text
    • http://kubemumibesedu.epizy.com/29920461334.pdfIn PDF document text
    • http://letugupinuvanu.rf.gd/raja_kali_amman_movie_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/a_global_warming_ielts_reading_answers.pdfIn PDF document text
    • http://fogevodazeta.epizy.com/chrome_extension_translate.pdfIn PDF document text
    • http://xunevonobi.epizy.com/new_version_whatsapp_plus_2019.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_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 5372 bytes
SHA-256: 2d3735b33aa03615fc3fe59da26188013946defe9e7d9d66507f8cd5a694f9d9
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11376 bytes
SHA-256: 0135a9a7cb913d9a3f9f919a155ce59eea3c2a55fcadc5895faf3c6ed9428daa

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