Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f03c6134d661b…

MALICIOUS

PDF

66.5 KB Created: 2020-11-25 22:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ea858afd12caa1489c99182b804dc2 SHA-1: 1ccd97d0fc36b84ab51e0c24bfea82c724c1c964 SHA-256: e20f03c6134d661b53c7364f7d3a0cf5c7c520ddfbe074b78714f0fcc927e18c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, with the primary suspicious URL being https://trafffi.ru/aws. This suggests the document is designed to redirect users to potentially harmful websites, possibly 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://trafffi.ru/aws?utm_term=chemguide+questions+enthalpies+of+solution
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/4159673.pdf
    • https://giledaxije.weebly.com/uploads/1/3/4/3/134312043/8654280.pdf
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f91801dc576f.pdf
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f923b4f20c14.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f970f33d46e8.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f998b166f10f.pdf
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fad7b689260d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ca58b23-cdef-4f6c-a083-816c94e20fe8/40644363188.pdf
    • https://s3.amazonaws.com/megulu/68407417607.pdf
    • https://uploads.strikinglycdn.com/files/d31dcb04-0982-4f10-89c8-6ddf386dbd1f/stonehearth_free_download_alpha_21.pdf
    • https://uploads.strikinglycdn.com/files/e135d916-eda9-4711-9d4b-72e5ec69dbac/kutemokudijeziwipotosu.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_off0000c765.bin
baf4c84b39d2a4eb33e0ae773e9b078eb70ce6fd66f8d8f7d091473e5831c5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 5388 bytes
font_01_sfnt_off0000d98b.bin
353a35471b1e43d1bcc2f078caa504a7dd26e00facce3766b001f1e6c410b201
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 10468 bytes