Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80228c90b7282f1…

MALICIOUS

PDF

84.8 KB Created: 2020-12-10 15:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: acd3d30355c58a3de6fddd4a693d9026 SHA-1: d63a0e11e02eecfb03e07e30f3023faa4621c663 SHA-256: a80228c90b7282f1f2707c99109e49f064c8089f8485e286ce43a91a8dd2e6bb
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://gettraff.ru/strik?utm_term=introduction+to+morphology'. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of embedded URLs and the ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

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://gettraff.ru/strik?utm_term=introduction+to+morphology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f90a2cb964a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_5fbe7aade9939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f8a0ae2438b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fcc07c011981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5fadd5b29b017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_5fbaaa0d67537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fa170cdc783d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_5f9cb5f42adb3.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/1f535c5a-a274-4348-b7eb-7d06364c39e1/super_mario_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b2956d-2112-42e0-9353-2f7a38639e46/18386723020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105dec84-4f63-4aea-aa8e-0bb48ad0d24c/97768631962.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/44833931279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3feb9f4a-d263-4d96-9929-2b425d80377a/88647527432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e0cebe-b7f6-4921-8576-07e1831bd616/xuzevuvisipen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925c17b3-79e7-4fb8-83ab-8e0fba91b95c/17125994833.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_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 5136 bytes
SHA-256: 97940b3ef985fd4e4bcb508fcf1f983ac3e13f1ccf2c4cb46bdab8fdc5bcb7df
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 11168 bytes
SHA-256: 692b6d03040eabefa61cd5e0a7e6f91d26a783558fd59d1d85b820d0d56b48e1

Open this report in the interactive analyzer, or submit your own file for analysis.