Malicious PDF — malware analysis report

Static analysis result for SHA-256 636478c66b5743a6…

MALICIOUS

PDF

73.4 KB Created: 2020-11-11 05:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87fadcfe22e18702828aec500c2219ff SHA-1: 6d84c9c4090e34756f35e7cd710c530395926e2c SHA-256: 636478c66b5743a621bbf7d74a9694c8b42e9d81bacaf2063caa69e5307c8466
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. Heuristics indicate a 'Fake invoice / payment lure' and a 'Callback phishing phone lure', suggesting a social engineering attempt. The presence of embedded URLs and the ClamAV detection further support its malicious nature, likely leading to credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?keyword=proform+345s+crosswalk+treadmill+cost
    • https://mikezexevi.weebly.com/uploads/1/3/4/5/134528008/1423460.pdf
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5fa63b73da54f.pdf
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5fa71ae0977d5.pdf
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f8b179059fa2.pdf
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/bokesipemutuxaxog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e3d6b51-fdd8-4a7e-be16-744c5118749e/sidonapevufunorazuniwa.pdf
    • https://uploads.strikinglycdn.com/files/58b4cd41-b716-42e2-bb32-d82807a93f54/25145430721.pdf
    • https://uploads.strikinglycdn.com/files/b96fada1-09b7-43e6-9e16-6fd808a80b6c/vera_panfilova_nude.pdf
    • https://s3.amazonaws.com/batoragubukepo/libijinupoliserabazipogi.pdf
    • https://s3.amazonaws.com/nimuwet/wisuzalugitosuwoxanox.pdf
    • https://uploads.strikinglycdn.com/files/bf2784d0-3116-47c4-bfc9-824425eb675e/saral_student_information_form.pdf
    • https://s3.amazonaws.com/ganubifirigevi/periplus_of_the_erythraean_sea.pdf
    • https://s3.amazonaws.com/mesotodimus/10120837891.pdf
    • https://s3.amazonaws.com/bopuxosavubare/61177780078.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_off0000dd9b.bin
ed75abd48b4e1fd9667c38689249ad2edc948b6612dbc20ef1a917692f44e362		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5700 bytes
font_01_sfnt_off0000f10e.bin
82af7349b6c1cb01a0675ba70b1e13efa1493b80502855ec9060d794c54e2829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 11808 bytes

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