Malicious PDF — malware analysis report

Static analysis result for SHA-256 248c6cfb647aa172…

MALICIOUS

PDF

67.6 KB Created: 2020-11-21 19:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49bfa21d095797728c0f7a3d0f7e2ac6 SHA-1: 50014a902956baef04f3a03b4cbb5169488f3604 SHA-256: 248c6cfb647aa172a39e2d0887c5226505de0b4101f5a1ec99b984ce3be9f012
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://gettraff.ru/123?utm_term=tejido+conjuntivo+laxo+donde+se+encuentra'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly flagged this PDF as malicious. The embedded document body text appears to be corrupted or obfuscated, but the presence of a malicious redirector URL is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=tejido+conjuntivo+laxo+donde+se+encuentra
    • https://fopabavegovos.weebly.com/uploads/1/3/4/7/134744375/3769832.pdf
    • https://vapipokolodux.weebly.com/uploads/1/3/4/3/134307816/jumamu.pdf
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/vesazatopu.pdf
    • https://cdn-cms.f-static.net/uploads/4461204/normal_5fa33ca7163e0.pdf
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/1900252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6a36c92-fba5-4923-b7d0-79368529b98b/46404732280.pdf
    • https://s3.amazonaws.com/kosamupim/the_magdalen_manuscript_free.pdf
    • https://s3.amazonaws.com/fatisake/52880670657.pdf
    • https://uploads.strikinglycdn.com/files/029f16b4-449f-4238-a1b2-bdd74e7769a3/rikufizolumabitugida.pdf
    • https://uploads.strikinglycdn.com/files/2f3a100c-0402-401b-9324-862537d78aa0/79252023066.pdf
    • https://s3.amazonaws.com/sukedil/23626456744.pdf
    • https://uploads.strikinglycdn.com/files/946a765f-c92a-4738-bae9-25a2074f12d4/ishimura_dead_space.pdf
    • https://s3.amazonaws.com/xesigeze/7879676281.pdf
    • https://uploads.strikinglycdn.com/files/bcf6c672-256c-4aeb-9409-bf44e514f116/1042414542.pdf
    • 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_off0000ca92.bin
567482eba38f2d2323175cdda0654b258ba2a57c66938b2ae0a80caac522b708
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 5084 bytes
font_01_sfnt_off0000dbf5.bin
178465b6707b7452ea93adf0fe9abc20af6288261c35d68758f242fa84ba3372
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11064 bytes