Malicious PDF — malware analysis report

Static analysis result for SHA-256 25019dfb9fb3a1e3…

MALICIOUS

PDF

70.0 KB Created: 2020-11-27 12:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a15edbaca17d3e26fa0cc427e6db5db8 SHA-1: d01953614c333c801ee304b9538f4eb676d55c0a SHA-256: 25019dfb9fb3a1e32ef85761a144a2316c408bafd79425a2ecac0987e992218c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as a phishing trojan. It contains numerous external links, with a primary suspicious URL pointing to 'trafficel.ru'. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=phrasal+verbs+get+worksheets+pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fac524bac7aa.pdf
    • https://cdn-cms.f-static.net/uploads/4391303/normal_5fa3c9d730aea.pdf
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fab8148295c5.pdf
    • https://cdn-cms.f-static.net/uploads/4422371/normal_5fa30dc66b8ff.pdf
    • https://cdn-cms.f-static.net/uploads/4385421/normal_5fa1e6dae5ef9.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5f97c6b82f9de.pdf
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5fc061b17a18a.pdf
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f8b411903e41.pdf
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/9988250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8fa9a679-5ecc-4f64-b3f7-3784db9ba5e3/live_tv_2g_all_mobile_download.pdf
    • https://uploads.strikinglycdn.com/files/1d99eae9-fa02-4e8e-b954-271d688018fc/15115098184.pdf
    • https://uploads.strikinglycdn.com/files/737140f7-692d-4606-bd7a-ca65fc90da3a/ttm_math_login.pdf
    • https://uploads.strikinglycdn.com/files/5f44444a-34b9-4dc2-b085-82b879a78e95/77023617374.pdf
    • https://uploads.strikinglycdn.com/files/483342c2-9bf3-4cb2-a103-d9874d15511f/vidakoj.pdf
    • https://uploads.strikinglycdn.com/files/c50a1526-5ff8-460d-941a-7aeb57461f12/52567402517.pdf
    • https://uploads.strikinglycdn.com/files/16598ddf-a477-43aa-90a5-38789d968a23/callpilot_manager_administration_login.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_off0000d240.bin
92299e9c2725f060c8ab54c0a26391889f8105860c13b514eba2e1dd50cc7bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 5660 bytes
font_01_sfnt_off0000e58d.bin
a4c9b634d808a71685813b5365b7ca24278afbd5ab4a563b20e6290dd3be8c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 10924 bytes

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