Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52a9475675bde55…

MALICIOUS

PDF

99.8 KB Created: 2020-12-27 17:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cae96e34834651e3772d7401328a223c SHA-1: 72ff44a28c6777687c5128fe0e0b6e6d3582a6fe SHA-256: a52a9475675bde550beed8d2c3644548000d8c3581caaf438a9b5fc411daf714
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://cctraff.ru/123?utm_term=lga+1155+best+gaming+cpu'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=lga+1155+best+gaming+cpu In PDF document text
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/1b1bf.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/99038031-ecbc-4ef9-b722-d57062d74e8e/12765705976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dd2b86-bdf1-487c-8826-a5ef7df1bdb1/47505566605.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/excel_quotation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/what_happens_during_neural_tube_formation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0aefd0-f9ad-4e4a-b486-51aa618e27ce/77842885554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718c0d64-cd28-4de0-8189-9427cc01787e/gotuti.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/pokewofiniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f850a42-ef14-4524-adaa-c87aced4ff20/44045278917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab61dca5-bc39-4338-9879-76c926474905/xevir.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/bootstrap_simple_home_page_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec888894-b429-4895-9071-a585d6312b39/minecraft_physics_mod.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_off00014850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14850 5380 bytes
SHA-256: 419f4ede87ddaf4eb9b66c7948f20971e2ba398ef3525a81ac506e6e5fe064f3
font_01_sfnt_off00015a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9E 11700 bytes
SHA-256: cc3a0b85c9ad9b8ec217b368bea6eb9afd34cc861865af173fde40132a7479b3

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