Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e6c9709e9a66dc…

MALICIOUS

PDF

80.2 KB Created: 2020-12-26 10:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89482943ef3921f6a80a56cf8a38a57e SHA-1: 58c5be15a5b8f71d241d275cb23a5a57cdc888df SHA-256: f7e6c9709e9a66dca8f3aa7d3d0dba602d4d020b2291d89aec1e18b382ad60d9
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The heuristic firings indicate that the PDF is a redirector and a link farm, with one URL specifically identified as leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=remix+os+64+bit+uefi+download
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/538229.pdf
    • https://cdn.sqhk.co/vosiwuli/jgghcjj/legends_of_runeterra_rank_reset.pdf
    • https://xuxavapivobe.weebly.com/uploads/1/3/4/5/134590147/7980025.pdf
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5fc39f5e0254b.pdf
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/9a4d597ec9f0.pdf
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/nipopozigofaviz.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/21fbe111f5c4ae.pdf
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5f8f068cc970f.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/zimowibolukumef.pdf
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5fe2b7e8c4f4b.pdf
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fcf5842046bb.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fd24fb960015.pdf
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/6272870.pdf
    • https://waxojokizubow.weebly.com/uploads/1/3/4/4/134482073/4308313.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53c.bin
58a61f665f60bd87de28b4827e9fa76dbb10a022d672b93b1edd14dee0eb40f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5504 bytes
font_01_sfnt_off0000f804.bin
55e66b4589be279805e54d71144917b4dc9b8126272380c12bcec0e550c6c4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 10912 bytes
font_02_sfnt_off00011dc0.bin
49ab5809b75b9d66816df8324754d620b3257740aa2da9a36946ef64adc19b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16684 bytes

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