Malicious PDF — malware analysis report

Static analysis result for SHA-256 747b3f1c0d493e96…

MALICIOUS

PDF

62.6 KB Created: 2020-11-14 04:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90a4abb0a959affcfb1c1c5455af34c8 SHA-1: 4f5dd8794abccaf303d23e77c8ca9cb46a48a607 SHA-256: 747b3f1c0d493e964b7364f789605ac7c80ed38ef0d00ed5b02a5f2f514d8f87
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a site that appears to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=patterns+of+world+history+combined+volume+pdf+free
    • https://vutefurawo.weebly.com/uploads/1/3/4/4/134471077/8935509.pdf
    • https://fetarulezi.weebly.com/uploads/1/3/4/4/134487317/tozewud-vedebiviv-povix-keruxanejo.pdf
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/9317098.pdf
    • https://cdn-cms.f-static.net/uploads/4389387/normal_5f92b4c99b49f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadedosi/baby_sleeping_songs_free.pdf
    • https://uploads.strikinglycdn.com/files/cc4c5c11-1ac2-4b1b-a4bb-92712f3c45c0/razaromexotobikobedijelus.pdf
    • https://s3.amazonaws.com/fidefofudi/melicoccus_bijugatus.pdf
    • https://uploads.strikinglycdn.com/files/15b2f454-bfbd-4814-a436-3ee9d373c60f/nowatamuxi.pdf
    • https://uploads.strikinglycdn.com/files/55836535-3190-47b0-b673-b83ce2179be7/55165090780.pdf
    • https://s3.amazonaws.com/zunewidimem/sojar.pdf
    • https://s3.amazonaws.com/gisujubolidine/avid_strategies_list.pdf
    • https://uploads.strikinglycdn.com/files/6ed64e6d-7002-4bad-9fed-09c0b8965f22/cub_scout_webelos_requirements_2017.pdf
    • https://uploads.strikinglycdn.com/files/e1e75b03-62b4-4acb-b3c9-f580408e4b01/jozumulafer.pdf
    • https://s3.amazonaws.com/divikufifir/quizzle_2_answers.pdf
    • https://s3.amazonaws.com/kavitokolezub/2951385876.pdf
    • https://s3.amazonaws.com/tutapaxi/download_file_from_link_in_c.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_off0000b75d.bin
df37d15bb9c8013a62af0ec59bb25326a2e451322f5f397574ac1fef889becd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB75D 5792 bytes
font_01_sfnt_off0000cb01.bin
e8903961cac328d90aadbe817970fe46e81e753974cfbd66ec281006e9ec2e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 10048 bytes