Malicious PDF — malware analysis report

Static analysis result for SHA-256 992eb4a968e807ac…

MALICIOUS

PDF

74.0 KB Created: 2020-11-11 22:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c7c86b3546a80ed49914e1c4a7cb82b SHA-1: 4b5423bb688eccbac2465dfc3593402720b41f85 SHA-256: 992eb4a968e807ac150b4c3baa9d63717a8840c8a20eead1e90f70cdcf2d4b39
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and hosts a link farm. The embedded URL points to 'traffset.ru', which is suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to 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://traffset.ru/123?utm_term=aflac+continuing+disability+claim+form
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5f9ea052622fd.pdf
    • https://cdn-cms.f-static.net/uploads/4488101/normal_5fa95aadcc0b5.pdf
    • https://cdn-cms.f-static.net/uploads/4453889/normal_5fa9912f8f8f6.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8a53a5e6ba9.pdf
    • https://cdn-cms.f-static.net/uploads/4454558/normal_5fa2d939e5b82.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f87cd471a1d9.pdf
    • https://xoxaworik.weebly.com/uploads/1/3/4/0/134012931/ludezupudazap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/052ee180-7945-4631-8dea-054d9514b2fc/pedomuwosumotuxujoxidija.pdf
    • https://s3.amazonaws.com/jolufozo/fukapusokazak.pdf
    • https://s3.amazonaws.com/povodijirig/wevovateledalenosofa.pdf
    • https://uploads.strikinglycdn.com/files/252f712b-722a-44c4-9e2c-1e7b7803a2f1/americus_nation_where_is_she_now.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde8.bin
87a3f2c3512a9daae8e99bad36c409d26d6b0a90e9aaa4561071b729616c5662
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE8 5572 bytes
font_01_sfnt_off0000e0d1.bin
961f2a279d13fb0a603cfe6acd61c72dfde900035191c87ce7f130e9efe59fce
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10720 bytes
font_02_sfnt_off000105b3.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 16140 bytes