Malicious PDF — malware analysis report

Static analysis result for SHA-256 42db6eef86b9b401…

MALICIOUS

PDF

71.0 KB Created: 2020-12-02 19:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adf5fe4bebe6ea548e4bf8237c6b461b SHA-1: 74e5daa02c87bd463d688be8b0d583c8b879945f SHA-256: 42db6eef86b9b4013a0177dd61dd404d0e10697ca0dd47509920d2bb7d4df53b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=rivers+in+georgia+usa
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5f9b7377b8fd7.pdf
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/9b0b355.pdf
    • https://cdn-cms.f-static.net/uploads/4454047/normal_5fb7068dedb07.pdf
    • https://fuvunubeliratak.weebly.com/uploads/1/3/4/6/134610803/relanubemexatej.pdf
    • https://cdn-cms.f-static.net/uploads/4401714/normal_5fa0e6771296d.pdf
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5f982ff9218d9.pdf
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fbee22915962.pdf
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fb8c2f3ab726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xufujofaleki/19946186980.pdf
    • https://static1.squarespace.com/static/5fc1a765405d5340f32ee4e2/t/5fc51ed35147b14804d5fa5f/1606754005510/denaraxisifuwidosozutalom.pdf
    • https://s3.amazonaws.com/wegemebufojafak/9717872029.pdf
    • https://static1.squarespace.com/static/5fbffb332bbd740658015355/t/5fc384a54f983757204d148a/1606648998150/clash_of_clans_hack_cheat_codes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf15.bin
6833f32e5d98d472de4328f513b003f472ed002a93937f61f55de23067f1476f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 4688 bytes
font_01_sfnt_off0000df12.bin
f2b30f7ad2dd859a1b280c6e3315d44f5d6286b7272a56763cd2e1ad8268e2db
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 9960 bytes
font_02_sfnt_off00010155.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 4324 bytes