Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bec70d90bece85…

MALICIOUS

PDF

60.7 KB Created: 2020-12-09 10:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c3dc21fd6cfd2723aeaacf1c14a7e9 SHA-1: 1f8770a0834eee3ca04abe54285235b9874c4e88 SHA-256: d0bec70d90bece85430a080f5c7e369a196d0dc2f3db75fcbb3e2c057c5e1e2c
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to a suspicious domain, likely intended to host a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a pretext of an official approval letter to encourage user interaction with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/strik?utm_term=reasonable+accommodation+approval+letter+to+employee
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5fcc1a8e3ec91.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_5fb79f233df72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pokorevalaxex/45441092162.pdf
    • https://uploads.strikinglycdn.com/files/1145b68c-47c1-4fe3-9da8-85b8f8e244f3/latorodoti.pdf
    • https://uploads.strikinglycdn.com/files/7acccb7b-800d-4c92-b991-87bb78c48120/35607707494.pdf
    • https://static1.squarespace.com/static/5fc58f90b8467722f1f3741f/t/5fcf34b0caa95a391e68d7cb/1607414960963/67072125919.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf5b9b474932ca266e426/1606219199835/kafaxutakenedipabupaj.pdf
    • https://s3.amazonaws.com/zerepuzuze/fourier_analysis_and_partial_differential_equations.pdf
    • https://s3.amazonaws.com/muxegeza/the_tyrant_falls_in_love_kiss.pdf
    • https://s3.amazonaws.com/sojaxub/northridge_elementary_school_nd.pdf
    • https://uploads.strikinglycdn.com/files/10653c66-e120-4a39-9104-f097c361733d/whirligig_book.pdf
    • https://uploads.strikinglycdn.com/files/b9f2c8e5-3257-4578-9376-c7a33268cd76/gorefelopurov.pdf
    • https://static1.squarespace.com/static/5fc2f4402e537a05ef168230/t/5fcceb5e260a660a6bdba610/1607265118987/marvel_comics_creator_net_worth.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_off0000b1f2.bin
84fcafa456ef32a7deeb28c1e1352782d00a4e061e8ac46796e429a87f1e7e25
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 5528 bytes
font_01_sfnt_off0000c4b3.bin
374243636f54fdd0f7ee54bacebc9af5fca801aa24a6f8b8e843a5599338eb0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 9748 bytes