Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cba7f990e60026c…

MALICIOUS

PDF

66.0 KB Created: 2020-12-14 21:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59babe4ee601cd55f509a204e5a0aa76 SHA-1: 11ae2bbb0739cdbe6d5d97c8951521cb241d13d1 SHA-256: 3cba7f990e60026ca8fccbe8b45d203d8ac2047bab257b055858dbe726d08b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a potentially malicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect the user to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=pink+panther+sheet+music+trumpet
    • https://cdn-cms.f-static.net/uploads/4411493/normal_5f9688555bc46.pdf
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/ritik_suvorofe_sipaxivefaxowel.pdf
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5fcd2cc9d9df5.pdf
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fd758067b6bd.pdf
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f9a296e176b1.pdf
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5fc85f044b854.pdf
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/vuxesewez-bevilegi-wemog.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f871e67e5745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xonaxevetaf/57013371333.pdf
    • https://uploads.strikinglycdn.com/files/0d334122-023d-41fa-afb9-e7897dd08027/is_vivaldis_winter_music_polyphonic_texture.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_off0000c5ab.bin
b24e8a4d7ae4e9a644c0735ca83781c51466e35bd59ac872f63fb143109dbcab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 5208 bytes
font_01_sfnt_off0000d736.bin
5e417c129577f58514d2040dba136fbb137973814dff4329a8c49b18e96461a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 10588 bytes

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