Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a20691a5a3204c8…

MALICIOUS

PDF

73.7 KB Created: 2020-11-27 03:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3a11c911994659eaea6134c49a0a70b9 SHA-1: d2a8dda275333573381f13af6d8be6f51a3f3cbe SHA-256: 8a20691a5a3204c83a94959249f8650a2d05dbbc06b6449a2ee6c72bf378406d
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating a phishing and trojan-like behavior. Heuristics identified the use of urgency and callback lures, common in phishing campaigns. The embedded URI points to a suspicious domain, likely serving as the initial landing page for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=wayne+and+garth+costumes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fb44154545d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_5fbba38ae3f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f8b35ad10ad4.pdfIn PDF document text
    • https://vexebosarewasu.weebly.com/uploads/1/3/4/6/134699383/dalegog.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/nuxenoluv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/acl_njcl_national_latin_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72bdfdb-6fda-4401-9703-7d45836dd702/75737741209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dabf369-8e4a-409e-a345-dc4e70f58c85/95154738671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa51f48f-e696-4c42-8aac-cebf98d5e1dd/64360973877.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 5436 bytes
SHA-256: b6ecbe4e6a2d60f893d60d6f0c6f3332a6598a1793acb573f84278fa6436dd0e
font_01_sfnt_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 11776 bytes
SHA-256: 65d47fb9951c2728adc30a705b3a8322df53331e866a11cb01c61903314a938c
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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