Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ca793aa0c6c68c…

MALICIOUS

PDF

82.5 KB Created: 2020-12-27 06:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d8ce840911c536b1f9bcb4e4dbaca5 SHA-1: 1759b49729672ca443f03ce9ff92d06569f28833 SHA-256: 81ca793aa0c6c68cac6b8cfbbd2041c92648f7deb364c8510c43e633e2eaf7cc
156 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 SEO spam campaign. It contains a large number of external links, including one pointing to 'trafficel.ru', suggesting an attempt to redirect users to potentially harmful websites. No scripts were extracted, but the PDF structure itself is weaponized to host these links.

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://trafficel.ru/123?utm_term=lake+link+wisconsin+dells
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5fc5505ce8e9e.pdf
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/581319.pdf
    • https://cdn.sqhk.co/bizujonad/TpccfG7/goodreads_quotes_hopeless_romantic.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/susonanezaj/rixewupimitozejezon.pdf
    • https://uploads.strikinglycdn.com/files/aaf286ae-3708-4322-be8c-5c79c5a7c9bc/let_s_vegas_casino-_slot_roulette.pdf
    • https://s3.amazonaws.com/tomamujuf/area_of_compound_shapes_worksheet_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/57239856-d310-4cd7-9351-3cfbd4f4a5c6/crosman_pellet_pistol.pdf
    • https://uploads.strikinglycdn.com/files/c8c38e4d-6fd1-4e92-b0c5-b44f0c51448e/cleric_5e_life_domain.pdf
    • https://uploads.strikinglycdn.com/files/9ac03d16-8f0a-40fd-a9c5-05df8c0fb991/82014153526.pdf
    • https://uploads.strikinglycdn.com/files/1f2b2610-d1d6-44c3-96b7-4f501a9a3845/32143496353.pdf
    • https://uploads.strikinglycdn.com/files/2fd4de53-0c56-4dbf-9652-fce95c6acb5d/wild_things_pool_scene_time_in_movie.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_off000104bc.bin
75fa2f90c75b71a61d9eadbb6b0a06b8d044c983c9fcde615a1900b199a86e81
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 4932 bytes
font_01_sfnt_off000115af.bin
c25c110e53155f154e470d19fdbca68138ced4365b18694123baef6025e93b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 11888 bytes