Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d89c9acc8a2ed2f…

MALICIOUS

PDF

56.6 KB Created: 2020-12-20 22:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb85a67f8684c8aeab68a03782d4a15 SHA-1: c9385ee74aa7e1e44bbcd4a8d65fe9851c5b98fb SHA-256: 5d89c9acc8a2ed2f435953e8164037fd7030a45531e49616c286596fa03b26ab
242 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links, including one pointing to a known malicious redirector, suggests an attempt to lure users to malicious content or phishing sites. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=clinique+take+the+day+off+cleansing+oil
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/5857b3c1cb.pdf
    • https://ludamezowi.weebly.com/uploads/1/3/4/1/134131800/gupenalixemip.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdf
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/mofekuzukigilu.pdf
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5f98acdcad9e7.pdf
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/varofunusu_xokulek.pdf
    • https://jobekivisa.weebly.com/uploads/1/3/4/5/134584889/74045a2441.pdf
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5f8ba93c45737.pdf
    • https://liguroxuf.weebly.com/uploads/1/3/4/4/134443360/gokapipixak-zanet-nepuwagopir-gawunoxeledede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/505bf97a-48cf-4e2d-81c6-71d68b226e51/xotok.pdf
    • https://uploads.strikinglycdn.com/files/302fb611-0091-4e94-9a9c-b5948271b4ec/14616096080.pdf
    • https://uploads.strikinglycdn.com/files/d30dbceb-06cf-4b5a-886e-6aa3c7fe3e7a/5307254074.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin
d88f8133eda92493d82d5472406b7cd9da34d31a5efaf1bcbb8c3db01c686f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 5384 bytes