Malicious PDF — malware analysis report

Static analysis result for SHA-256 a148ccb91228a506…

MALICIOUS

PDF

57.8 KB Created: 2020-12-18 00:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b5dfdb3f35172a7b5671a5e9e9f4a26 SHA-1: 47aed4c2b5a71c41002e44dd1de7b4ce7e678675 SHA-256: a148ccb91228a506a07834bed09f08e564cc5b6a77dde753d289eb58b8be9083
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The presence of embedded URLs and the link farm structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=sears+x+cargo+mounting+hardware
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f8cef89ab8e5.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f99997fa10cc.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/7127039.pdf
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5fa35f2f075e4.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fac17f0666b5.pdf
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5fcf829bb7445.pdf
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fc497c1d7b61.pdf
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5fa6693a2c8b6.pdf
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f9669471143b.pdf
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/waroxudewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01fbc7afe470b5571957/1606222333202/monty_python_bishop_of_leicester.pdf
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc68fa1f81c9a2a0c890cd1/1606848418399/30248666709.pdf
    • https://s3.amazonaws.com/pubopelej/mudowejomerogag.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_off0000a992.bin
8f2ab2431d8fa38f41a3e9c73773a740bb550b4a5b84230a15697846790a61f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA992 5584 bytes
font_01_sfnt_off0000bc74.bin
28b00b9e330e23ab62670971c0b2c26a3f4ca941798ed8c4a0d15bfadec3e661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 8784 bytes

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