Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa51639138775b2…

MALICIOUS

PDF

74.0 KB Created: 2021-01-04 18:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0710a90cedbc04fc44d6d00ec9a3edf2 SHA-1: 70780d4d5ca1599ba2964f8052b80ae73552c9d3 SHA-256: 9fa51639138775b2b7f9fda720a104fd58818fd5edf1acfcbdedeb2e07c9d3fa
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or redirector campaign. It contains a large number of embedded URLs, including a critical finding of a PDF link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to direct users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=acestream+apk+android+4.+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_5fd7a100ce3f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5fcf1de94d9fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_5fd6363e1d8a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_5fd7a293d64e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5faadd7c0200b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd69fb06fe17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_5fb2c2f20214d.pdfIn PDF document text
    • https://fikamuvereza.weebly.com/uploads/1/3/4/7/134754658/lamejej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_5fe54f789db1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5f9ad2744dba9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/518f29b9-f5ba-4f80-98b1-3c314445380d/rapoziberujalox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddf1dc1-ab5c-4abe-9a3a-067da1489875/the_results_pyramid_partners_in_leadership.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5360 bytes
SHA-256: 1348ae0a6372d3f061997a8d15e15a5ac264d91c67c656758cf590fa8a509e28
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 9976 bytes
SHA-256: 1759abef34e1300befc31f1c6eaf19d4feeb356ed5a42327adff987ce01e22b9

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