Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f00fe104de1826…

MALICIOUS

PDF

69.7 KB Created: 2020-11-25 01:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34d49b113532bdc9aa08c7fe8765c848 SHA-1: ed1e39cd3849c53321a558997ac28a6b0d6c2e87 SHA-256: 55f00fe104de1826e761381b19b2dd4eb9da77d6e698a21451c415363aa42e8c
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 hosted on various platforms, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is trafftec.ru, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://trafftec.ru/strik?utm_term=liu+post+library+hours
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/1706279.pdf
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/xezomomob-sesuwuriz-judesopagu.pdf
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5f90f421b0653.pdf
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/katavolus.pdf
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/taravupudadademo.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f88fb227f7df.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f875ee3ebd0f.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fb3f8e519878.pdf
    • https://cdn-cms.f-static.net/uploads/4445735/normal_5fa20711c1c00.pdf
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/23babeb97f2b52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20c7f48a-22a0-4c3f-bbf2-f7c1eb147ae5/vulakogagi.pdf
    • https://s3.amazonaws.com/jebokizez/1479787779.pdf
    • https://uploads.strikinglycdn.com/files/7746033b-03b2-491e-b5a6-7249bbbd0203/rupoor_legend_of_zelda.pdf
    • https://uploads.strikinglycdn.com/files/49204856-d84d-4cf6-8ee7-7f2a39f99657/bizebunapagosinejafe.pdf
    • https://s3.amazonaws.com/tobaziw/96036103395.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_off0000c9c5.bin
736fdbf3acd17ca76cea818a58c8017e982a5d2b83697f7291e6e8c0b01cd8b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 5092 bytes
font_01_sfnt_off0000db03.bin
3775f1277d79cffd6c55adc73710ea8a48b6ee76df829cbff88df72ec20fe8d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 1948 bytes
font_02_sfnt_off0000e45f.bin
0a3bfa1c454792ad5d43e307d16e64c17a66b8351d1541dc343e3f9cc079965c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 11616 bytes