Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e68a25d572890b…

MALICIOUS

PDF

58.2 KB Created: 2020-12-13 21:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18809d6b85a3a2b2f643ce2f84a8a8ba SHA-1: 1c8c9335a06e2c2e33caf6815f4d7aabe72ded7e SHA-256: 03e68a25d572890bad76dfda7a9255e63da844f86204ffccaa39d3cfe930fdb0
212 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8446

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.
  • 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
  • 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/strik?utm_term=meaning+in+lieu+of
    • https://cdn-cms.f-static.net/uploads/4417645/normal_5f9f03d1747db.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f972c6dd2999.pdf
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5f8ea0f8d8f1e.pdf
    • https://cdn-cms.f-static.net/uploads/4426549/normal_5fb464599841f.pdf
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5fcc25f7809ab.pdf
    • https://dinurafilaxu.weebly.com/uploads/1/3/4/6/134621410/946a6.pdf
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/a1c9ac.pdf
    • https://static.s123-cdn-static.com/uploads/4418180/normal_5fd035cf2351c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusixa/ftc_buyers_guide_for_used_cars.pdf
    • https://s3.amazonaws.com/lomogas/what_is_tft_display.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b990.bin
e18d95b9725cf542335898a1df4d9f22a7e5c00138106d7d2df32da7d820f416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB990 4468 bytes
font_01_sfnt_off0000c8d4.bin
a6c3c4c9023f1e4a3abdc5b02711cb4f2d16b94a3fac21d4b50c31e0eca7d0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 11648 bytes

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