Malicious PDF — malware analysis report

Static analysis result for SHA-256 6944963e6a02d492…

MALICIOUS

PDF

97.2 KB Created: 2020-12-01 22:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b7ac31f4ead1ca942fbc3960fa8eb0 SHA-1: 5c84322d7a317a7bbe3a2368e4856b6259c36980 SHA-256: 6944963e6a02d492415686963f4f74e3277bd345a202809812cd0cd1d382b315
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to lead users to potentially malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the structure and embedded links strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=the+magician%2527s+nephew+book+pdf
    • https://cdn-cms.f-static.net/uploads/4419626/normal_5fa7e62f1825d.pdf
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/5a46e4a03f1de62.pdf
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f9ca4d0aee1c.pdf
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/lurazivupulezazaso.pdf
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/rowotapixexeseruko.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/108da588d8fe70.pdf
    • https://cdn-cms.f-static.net/uploads/4413967/normal_5f96180793c9d.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/6262092.pdf
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/detibixiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nevowimo/94789943151.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f5c.bin
9746d3b1373d9a110181bb9647b9c336bea78409e3b1d5591445a7171ecd6ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5C 5720 bytes
font_01_sfnt_off000152c8.bin
88082d6f80c1b1748ab15deeadac1e2c299c727c8ec926e3510308ce649018a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152C8 10908 bytes

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