Malicious PDF — malware analysis report

Static analysis result for SHA-256 539c2947567c3bdd…

MALICIOUS

PDF

59.3 KB Created: 2020-11-25 07:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1bc9a1680ae1248505f0d2d6f6cb5b37 SHA-1: d245eba1bda678d50927c9a97d21eb2955aae49e SHA-256: 539c2947567c3bdd21fcb35fa0352b795f091d6d1d0c173d331bf1df96a029c2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=140.6+miles+to+km In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5f902ffbdac81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f97d5ea8be1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5f9ad116bf177.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/35aff825-b04e-4e8f-95f7-6c67cdb6b6be/4591178889.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/loners_on_wheels_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e230790f-eb4f-4912-a8c6-ecc4658aea4e/36612175306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42b1545-b981-4efc-9c2a-4f167e963696/solajarejize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4105f42-2305-4a6a-b8bf-3f1be21baf35/44729968702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9227c3c4-e26f-4478-96bd-b515997ae1d2/antenna_and_wave_propagation_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0341e582-5d54-4d2d-9119-cb954db06c1f/lojapemuzijobujura.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/duwukad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30511c52-49f9-45a1-bcbb-a869cff4be72/ccass_guide_hkex.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/sodupepuj.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/tekinofot.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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 4964 bytes
SHA-256: 96cedd14a01a8cdbb08ce0bb0bcfab5c00bd9b2fc877ab2b29c45b20b58e2957
font_01_sfnt_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 9444 bytes
SHA-256: 23961a96879f3a5142bea5a81810ee258f8487fe88f26f625dec3d64bbfec96a

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