Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a0e03ca37fab21…

MALICIOUS

PDF

76.4 KB Created: 2020-12-24 22:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b419c74f459c1e63c8b38bc6d48dba2 SHA-1: bbfd2d452af9cf781c651efa4f669487f415977a SHA-256: 59a0e03ca37fab2181c43796b657a9bc0383532014011780bc2ccbdc62f742f6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, with many pointing to Weebly-hosted PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan threat. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites, potentially 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://traffine.ru/strik?utm_term=cut+the+rope+time+travel+6-+15
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/2987197.pdf
    • https://ginorafixane.weebly.com/uploads/1/3/4/7/134722580/damiz.pdf
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/7401560.pdf
    • https://rumeravovavupol.weebly.com/uploads/1/3/4/6/134619367/2ce98baa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6abd044e-2938-45a3-a7b0-700d88994fe2/75606089338.pdf
    • https://uploads.strikinglycdn.com/files/491366a4-facd-4762-8ccb-e78bac052ec4/sofener.pdf
    • https://uploads.strikinglycdn.com/files/be8f719e-4807-48f7-9402-00781b31d3ab/41784748405.pdf
    • https://uploads.strikinglycdn.com/files/99a7bb2e-f979-4f0b-aa95-ca6bc32dd459/sinozaxivadevupexafu.pdf
    • https://uploads.strikinglycdn.com/files/de360aa3-71e6-44a6-9c7c-906fb922eedb/66555212230.pdf
    • https://uploads.strikinglycdn.com/files/4a40d57f-a8b6-4761-890e-358188e717d4/4461582211.pdf
    • https://uploads.strikinglycdn.com/files/10faaa4f-6b01-43ad-b8dc-0178a9985fdf/bob_koch_basketball.pdf
    • https://uploads.strikinglycdn.com/files/b4c23f83-cb20-4c38-9277-334c8390e3e6/doro_7050_manual.pdf
    • https://uploads.strikinglycdn.com/files/4593d55b-5258-4b8b-86dc-92a29e4687c0/niguvizegevikujaf.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_off0000effe.bin
c6e3a0564909527424b09040175b43bd47799a9b0138864de3e88ed55be07279
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5208 bytes
font_01_sfnt_off00010198.bin
139f013b54f2691332caa43c5bcab99898e077b3c359ee91a19af97fa60e42a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 10232 bytes