Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1532376226dc29…

MALICIOUS

PDF

57.5 KB Created: 2020-11-17 17:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ffd2275acd5ae673d85915ecad9d4a SHA-1: 92e8827c539749d3615301b0a4586fa9895dcd3e SHA-256: ae1532376226dc296f7362ec63e89838634f132773e81663f219af1de42d69a7
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, specifically flagged as a phishing trojan. It contains an embedded URL pointing to 'trafffe.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Intel hd4400 drivers', suggesting a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=intel+hd4400+drivers
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5fad980aae16c.pdf
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8d7b8855501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rodiligarexo/bmj_case_reports_scimago.pdf
    • https://s3.amazonaws.com/kagedatabujo/nitexefazijimefajaw.pdf
    • https://uploads.strikinglycdn.com/files/457a052c-065a-4cbb-9733-c340a32b8778/26758198268.pdf
    • https://s3.amazonaws.com/gupuso/lesson_plan_template_editable.pdf
    • https://uploads.strikinglycdn.com/files/14cb83dd-73d5-4ba0-82de-f75d1394b283/46811372042.pdf
    • https://s3.amazonaws.com/fedufiporara/2891604277.pdf
    • https://s3.amazonaws.com/mijedusovineti/blackbird_tabs_guitar.pdf
    • https://s3.amazonaws.com/gupuso/dagozukavazaxetepe.pdf
    • https://s3.amazonaws.com/dobesogum/brimfield_ohio_police_reports.pdf
    • https://uploads.strikinglycdn.com/files/64c4e6cd-448b-48d7-a35f-5253b7f531ab/59545684953.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_off0000a911.bin
42e68e98a9e685d5e84b55e21f54653971361ab13f1f4e9965e62269b8f4a4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA911 4932 bytes
font_01_sfnt_off0000b9d4.bin
f963557d616776d7c047b73132ee76e1b106752eb2c2fd8c7de719eb51288a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 9312 bytes

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