Malicious PDF — malware analysis report

Static analysis result for SHA-256 35267663c3148e07…

MALICIOUS

PDF

67.7 KB Created: 2020-12-21 18:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a61b6927ebff624810bcc2cf5cc3aa0 SHA-1: d7d9b6da3d7dc6e2dde20c3a0bf11c80d9a2df08 SHA-256: 35267663c3148e078d3e4c04b0d5429018ece770fd237e35e80d3d08199c340c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to reference fitness content, suggesting a lure to disguise malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=skipping+rope+workout+for+fat+loss
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f88b94d47821.pdf
    • https://vuzitiruf.weebly.com/uploads/1/3/2/8/132814505/likeribujegokok-rogupunotujexil-palur.pdf
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fc1a8b05fd03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eeb3b9e8-1992-444d-b5fc-ff690da93075/sigomabafowi.pdf
    • https://static1.squarespace.com/static/5fc5659f6609fd0ee7af9d99/t/5fc8aa02f97c193540f531d2/1606986242908/70227422199.pdf
    • https://static1.squarespace.com/static/5fc6c41abcf5f06bcb746227/t/5fc9ad8f55485c3109ae7ef5/1607052689290/sniper_games_for_pc_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/0a8dfd4a-2e96-448f-b1df-aabed7d38288/31847391672.pdf
    • https://uploads.strikinglycdn.com/files/f8d85fb8-2ca1-4975-84e3-7c3bcd6a56b0/63301573896.pdf
    • https://static1.squarespace.com/static/5fc36c8fec917750a3e7ce8f/t/5fcef68acd9a2056ff6b37cc/1607399051867/gizuxobigaruderi.pdf
    • https://uploads.strikinglycdn.com/files/120e5dad-95a7-4961-ad80-7d21265e11b7/77742503544.pdf
    • https://uploads.strikinglycdn.com/files/88a1d923-fb69-44ed-ad0a-11dbdcd4c74c/to_ride_a_silver_broom_stick.pdf
    • https://uploads.strikinglycdn.com/files/703181f8-2eaa-45b3-890c-a1ecc0462f31/vestal_buick_gmc_kernersville.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_off0000cb60.bin
9954cfdd2c2d93a6dc85c63fabd1d2b4f43750535bdd2d1c9d4f1f06e68da5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 5328 bytes
font_01_sfnt_off0000ddaa.bin
cfa4b36be01e0d2ff4b0d5d4cab643945452e23820ca88c9c98ad883a0b29b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 10648 bytes

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