Malicious PDF — malware analysis report

Static analysis result for SHA-256 3855a022ffe61cbf…

MALICIOUS

PDF

77.8 KB Created: 2021-01-20 21:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7abb35761c7951d79b09d7d53037a86d SHA-1: b9e79c968311ec16232e1e3dcadd292644be202b SHA-256: 3855a022ffe61cbf684da54e0703a63f6f807a2d599c7fcd3c100770a8eddc4a
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and part of a link farm. The embedded links, such as 'https://cctraff.ru/123?utm_term=fremennik+trials+osrs+riddle', likely lead to phishing or malware download sites. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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://cctraff.ru/123?utm_term=fremennik+trials+osrs+riddle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fbcf352dd81d.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/bukitosego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480897/normal_6003f55db7b9c.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/4djiSj4/mirror_salon_suite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_5fb30b9f5bb6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5ff4d53467cb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fc639ffcd16e.pdfIn PDF document text
    • https://sorajofuwomukiz.weebly.com/uploads/1/3/1/4/131407138/papulatevevabe-tumuxugolexaji-bugozope.pdfIn PDF document text
    • https://site-1194448.mozfiles.com/files/1194448/89768768198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368475/normal_5fdea1e1131d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_5fda8d0ff0920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fa1c9c489373.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/wesezuzuvalirik/whatsapp_video_calling_app_free_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/fobupe.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_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 4988 bytes
SHA-256: 1c3c399389cd7ed3b389f17874d62901333beced8f740f7eec82d020b407ca0d
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10288 bytes
SHA-256: 9fb7b73fc8c70eb873d0c5a8c9cd683679c2c6dc07407348f948b5b89e397b72

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