Malicious PDF — malware analysis report

Static analysis result for SHA-256 889850d2eb1097af…

MALICIOUS

PDF

77.4 KB Created: 2020-12-19 12:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12cc1575502556773283e527c7ea377c SHA-1: 53c97e8a6a7452f4faf7f3dc4308d900c02552ff SHA-256: 889850d2eb1097af30a3d555974206a573827ed4c9210ae7a0a8cbf44ae40abc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://trafffi.ru/strik?utm_term=dipole+induced+dipole+attraction
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/mafutofibikani.pdf
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fdc29b5997e9.pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5fbfa1fe544cd.pdf
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fbf08799b47b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c874fbce-38b1-4fef-a287-95d49aceb0b6/spiderman_on_pc.pdf
    • https://s3.amazonaws.com/jinabom/codycross_answers_group_4.pdf
    • https://uploads.strikinglycdn.com/files/281300c2-2ff9-44ca-a6e8-46b1228fd1a3/15694716198.pdf
    • https://uploads.strikinglycdn.com/files/c7e775d0-4e5d-4bf2-9fca-1aaf0dbb6a06/gusikarodu.pdf
    • https://uploads.strikinglycdn.com/files/94dbbadf-f7b4-4391-9153-156107691cc2/need_for_speed_run_cheat_codes.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_off0000f02d.bin
8b6624ce379ed6233c2502ea9d4e4b67469fe66bdd16da66178a827c94648db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 4888 bytes
font_01_sfnt_off000100e1.bin
ab443918423337255deb3d5db20159e410e1a13ca2465551ac1c7f476505ee66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 11856 bytes

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