Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ff55771bff9ae8…

MALICIOUS

PDF

62.8 KB Created: 2020-12-18 11:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3683f358e225990ff60ebce7ca3eeb94 SHA-1: d534dc095dbb15e5e832df2ffee7a55b8d172132 SHA-256: d4ff55771bff9ae8deb86a2f680858096db84ce52d77c1e3adc8c8e80e95fb70
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=nyc+doe+hr+connect+custhelp
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f90340c707f7.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f97e9b2d10d5.pdf
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5fbd5808cf30a.pdf
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/rasotaxuvafadiwavot.pdf
    • https://cdn-cms.f-static.net/uploads/4393628/normal_5fb2a45ddb352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ziwuvijevo/vepurogotemotaretunisobak.pdf
    • https://s3.amazonaws.com/ladojenefe/vekovadodawaz.pdf
    • https://uploads.strikinglycdn.com/files/4252bc83-29e8-4301-abfe-0d84c098eeb9/sonic_level_designer.pdf
    • https://uploads.strikinglycdn.com/files/60fd528b-32bc-4b1e-820c-753b66acd989/wafuzaviropipal.pdf
    • https://uploads.strikinglycdn.com/files/a69026ff-7caa-4338-b70a-c841a4eb6b33/columbus_day_expeditionary_force_ali.pdf
    • https://s3.amazonaws.com/xupovobejanam/12613933296.pdf
    • https://uploads.strikinglycdn.com/files/647809b4-3cac-42aa-a242-ecef7dd4489e/garbage_guide_to_stardew_valley.pdf
    • https://s3.amazonaws.com/fasanag/anouilh_mde.pdf
    • https://www.schools.nyc.gov/employees
    • 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_off0000b744.bin
621035cf705f99918d69da4550dbc671a02ae00ff6ad1fdf3c4b6c4c38acbc0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB744 5024 bytes
font_01_sfnt_off0000c862.bin
6845acb3b58d0e15f1b8587a05cdf5562aa43ab430994c385526945404ff0198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 11204 bytes

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