Malicious PDF — malware analysis report

Static analysis result for SHA-256 317e5a0b0a1f39b1…

MALICIOUS

PDF

91.4 KB Created: 2020-11-18 14:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5b22f1b330e4709944c94c33e076e219 SHA-1: ec6ef72a0fb7c745fe445d2ff8b8fad97b491369 SHA-256: 317e5a0b0a1f39b190a221a603c66e51ce25271e83c997b1debf3649db9526a1
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to 'traffmen.ru', identified as a malicious redirector, and is also flagged for containing a mass external PDF link farm. The document body, though heavily obfuscated, suggests a lure related to 'Toefl ibt practice test free software'. The presence of embedded URLs and the critical heuristic firings strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?utm_term=toefl+ibt+practice+test+free++software In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f9f9e3ac1f1d.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/af2850cb.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/nojiw_kivugado_punozevuju_kusoxigeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_5fa368986e174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5f9a0d778c9c3.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/fisulefajow/33968049142.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/11471256363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29c9c57-de6e-4a10-a82e-9b39dedc575b/vadideki_zambak_dr.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/blue_eyes_song_lyrics_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1010ed-6474-4865-b69b-cab252bd2184/mirexit.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/88235243843.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/marketing_books_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/86232429584.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 5188 bytes
SHA-256: d325ff389937a56042a2bc3d2bf3e9944396a8a40fd4fa4e223bc7185b039aed
font_01_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 11296 bytes
SHA-256: 5c01f4dabc56de92744b62092ed7bd194098b7dcbe59eaec6b86b2259249eb7b
font_03_sfnt_off00014a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A10 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36

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