Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc91dc943855d68…

MALICIOUS

PDF

71.9 KB Created: 2021-01-04 20:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5499e08db5c0588e82815761ccb6ef1d SHA-1: 7273bdf16529b0a4abac80f27d91bcd02b9ae075 SHA-256: fdc91dc943855d68c652dfa8a0d6108ab986a842ab6e3943de596eac4ac3d6a3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/aws?utm_term=acidoc%25C3%25A9tose+diab%25C3%25A9tique+pdf+2017'. This URL is likely used to redirect the user to a phishing page or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=acidoc%25C3%25A9tose+diab%25C3%25A9tique+pdf+2017
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5fbb344963da4.pdf
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fbedfcd86f85.pdf
    • https://cdn.sqhk.co/dakagugi/igfVgjl/download_game_occupation_2._5_mod.pdf
    • https://cdn.sqhk.co/godanalumado/gVhadjf/wimejo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zeworibuzoza/curveball_game_hacked_unblocked.pdf
    • https://s3.amazonaws.com/takebemanijewok/cps_teacher_salary_schedule.pdf
    • https://s3.amazonaws.com/donarepemi/76118061919.pdf
    • https://uploads.strikinglycdn.com/files/0bb4e76a-1882-4ba8-98af-d8a833c72423/suwegavafagidarenu.pdf
    • https://s3.amazonaws.com/wegemebufojafak/tozewumevutagafikarujane.pdf
    • https://uploads.strikinglycdn.com/files/9c85918e-91c3-4c22-b466-7739afb16d1c/fojusolarasijajavamuxi.pdf
    • https://uploads.strikinglycdn.com/files/9c9b8967-bf18-4270-8b96-d6570a3767e1/5232276672.pdf
    • https://s3.amazonaws.com/nemafu/backwards_design_template.pdf
    • https://uploads.strikinglycdn.com/files/08dcb74a-754e-49a8-b19b-1669cc59800a/dark_souls_knights_honor_wikidot.pdf
    • https://s3.amazonaws.com/xafaxotaful/porarijosifelubidukitimug.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_off0000d387.bin
7b528f5764d3f2dfb30ccb3906f87e57124b1a1c3607c0a859c2ae9675df6a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 5824 bytes
font_01_sfnt_off0000e73b.bin
bb5b8a066f015727e2be18960297b6457aef9a83cf8a91f34bb19173f181e4c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 13436 bytes