Malicious PDF — malware analysis report

Static analysis result for SHA-256 4413b8dfcc914c23…

MALICIOUS

PDF

67.5 KB Created: 2020-11-18 04:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5b09dd4690a254f1b4df886fcfe4345 SHA-1: 59a9870c47f4da9aba1a51667007dfb443674818 SHA-256: 4413b8dfcc914c23e262812b75d9ed1b88466562f66ca9a0386260f0d30c1746
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a large number of external PDF links, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?utm_term=cricut+expression+2+manual+en+espa%25C3%25B1ol
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/abbdaebd8f2f4.pdf
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fb2e6a1598af.pdf
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5f9a67afa2e96.pdf
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/wowoxalalaf.pdf
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f91f0483feba.pdf
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/nekisofu-zedutuwusixo-zaxijenobowu-vujenoroviguka.pdf
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5fadf81087960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9991d5bf-ebb4-4ef0-8808-6d625afa2f94/puntos_toconomicos_del_feto.pdf
    • https://uploads.strikinglycdn.com/files/818a196d-ad54-4ade-9dbe-da21f8f79edd/what_is_accessible_income_on_credit_card_application.pdf
    • https://uploads.strikinglycdn.com/files/f81163b2-4a3d-4cda-af06-1b192a234d26/bolinevojegagipubazodex.pdf
    • https://uploads.strikinglycdn.com/files/878f62c0-eb58-4cb3-ba66-28ba4d444b86/21st_anniversary_gifts_for_wife.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_off0000c7e0.bin
2e76f0758c00653e1d6c38d8224b12647f636e62d96d7a9a72b492452d7e6cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 5396 bytes
font_01_sfnt_off0000d9e2.bin
27718089072de6d3ede4e846e4744255eb7e2800053e886017d2d86aa78b9ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 11156 bytes

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