Malicious PDF — malware analysis report

Static analysis result for SHA-256 4091412fcf814765…

MALICIOUS

PDF

66.2 KB Created: 2020-11-19 17:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5fcd0314894ab01f388051b068a0bae4 SHA-1: 1d5a2dbf35e35a0a4e7afa17de1c57f3a5c4361a SHA-256: 4091412fcf814765b5b78b0f1ba4ebb34725ee0dcbd2dc1b1b0ead1ff94822b8
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://traffking.ru/123?utm_term=crete+high+school+staff'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests a phishing or malware delivery attempt.

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
  • 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.
  • 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://traffking.ru/123?utm_term=crete+high+school+staff In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_5fb366c08899e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8aef14b9f44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8e5c71b6c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f871a57d796d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5fa5a0f41a73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f907316e293a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff273631-aa2c-4c8c-9823-5c46ae9d1ba1/25542235770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab4f7c0-6ce2-4ab6-9605-6f65d1147834/82891708577.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/vurivuzafunedovif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33229d7-6e22-4a15-9e41-ee8d4d84b558/kizogawupemepi.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/runescape_3_monster_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd91ab6e-ef86-4d4e-a8e6-8d3358bbdbad/42107058915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108cff84-755c-416c-8b69-fc4ffd2dbe6c/vinufonip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 5048 bytes
SHA-256: 4d063965d328283302080ee2791b56c9423d4c71bd91ee9bf9a62cede61d732b
font_01_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 11124 bytes
SHA-256: efdc2419eadc08fccf8546de05937dbeb3996eb6d1ce6c749d1a1eda035c990d

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