Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b0e585de981a45…

MALICIOUS

PDF

76.3 KB Created: 2020-12-29 22:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81769b525c4a59db7390c6ea29003521 SHA-1: d1badec9590d88a8d623dae674929172e6b52fc4 SHA-256: 54b0e585de981a45c267d9ed3920b9aa7270b5bcb8cf1ced3d17b4feca13aad3
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various PDF documents, indicative of a link farm or SEO manipulation scheme. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=linear+regression+formula+derivation
    • https://cdn.sqhk.co/barugogip/jbjg7Ic/43603596056.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdf
    • https://cdn-cms.f-static.net/uploads/4476122/normal_5fe82f246ebae.pdf
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5feb91a449246.pdf
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5feb23a513895.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f9d10b92fdb8.pdf
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fa3714b7b1f0.pdf
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/pigivojexidudamonuda.pdf
    • https://cdn-cms.f-static.net/uploads/4451766/normal_5fabe2368ac28.pdf
    • https://static.s123-cdn-static.com/uploads/4492246/normal_5fcf4459ad4c5.pdf
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fa4ea3059c3e.pdf
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f93e69126390.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/salade/zanidome.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de20.bin
295c6b89e4b51d1ee02a147401f60c05eab084cf7d71ff4a987b08e208b2f3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 5112 bytes
font_01_sfnt_off0000ef6c.bin
560954b1292b11137c0d5cb8d5d3573614ec72052e66db0c07c0291ea00c94cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 11332 bytes
font_02_sfnt_off00011646.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 4324 bytes

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