Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a8d8336c2d4b2…

MALICIOUS

PDF

65.3 KB Created: 2020-11-26 16:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 32ae345026c772e67e3fa37900a15057 SHA-1: 1fd6442a03df96e6443c883579565c1b4c1e4dca SHA-256: 850a8d8336c2d4b29c3bca6a85babc2f9c2f4204dac9e163352689d3f1d8010a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with a primary URL pointing to a phishing site. Heuristics indicate a link farm and ClamAV detection confirms it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'fishing clash hack reddit', further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/strik?utm_term=fishing+clash+hack+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5fbce8acd107f.pdfIn PDF document text
    • https://rewudorabemomaf.weebly.com/uploads/1/3/4/2/134234845/segexivuwebejume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_5fb3cf7442137.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/dikusone-nares-bekalixukowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad7f5a6-8e30-4311-a8c4-4f99f5a13512/2013_mncareers_facilitator_guide_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2af499-11bf-452d-9d7b-57ac646484e8/nanesasogajalijujemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ade1da8-add9-4e63-ac50-26d5dc961a98/no_long_talking_drake.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/62065051379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894d2219-3db6-4cf0-8ac6-759b6b2a8375/simple_harmonic_motion_problems_and_solutions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 5220 bytes
SHA-256: 696c441466a5d71a8c58390789d9533a2da77a2030ebb6658ff7c6d705c7bb49
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 2188 bytes
SHA-256: de4d6777c42a9a0b9cccd4030f0599f61369bf950d554910e4eb2a9885b29305
font_02_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 10368 bytes
SHA-256: 531ac4e8c399188270f8c87ef8f9f5f549aedcc6af8dd80443c08482571d87d6

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