Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce2963381fab053…

MALICIOUS

PDF

59.9 KB Created: 2021-01-02 08:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1c1ed171018661bb39c15ba4192f1bab SHA-1: 7fcc45cec410fe04a737cc35c0789d1c77f756f9 SHA-256: 9ce2963381fab05352da9af9d4d9639d4d0bf1e37d45b7be2d6103bf2ace1892
214 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to S3 buckets and other file-sharing services, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gettraff.ru/123?utm_term=age+structure+diagram+example In PDF document text
    • https://cdn.sqhk.co/xulawajikigi/hBqYrih/fefavu.pdfIn PDF document text
    • https://mexunavogowa.weebly.com/uploads/1/3/4/8/134887210/efef8d0466d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f929cdc7b546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_5fd87a1999971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5fd8514356f38.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/wapoked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tibitexil/89817520094.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/becker_auditing_and_attestation.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/1st_grade_math_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/equipped_for_every_good_work.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/zovupegak.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBF 5452 bytes
SHA-256: 005079d0fef8d2fdcb58041a176fc481a6616fb06a3039b8cf36b6d5f3bfe859
font_01_sfnt_off0000be39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE39 10440 bytes
SHA-256: 12bf3dddb627256969480d22e6831dcf3d797329e9db2aa65f8a635a1232ba26

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