Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4e79bff95435f0…

MALICIOUS

PDF

60.3 KB Created: 2020-12-16 05:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6162a2be37a1c882657040f6ec0e74b4 SHA-1: e9f1c4f3a4bb20ff69851c38ce1f92c1eadfabc4 SHA-256: ad4e79bff95435f0671bbd0351473752f551f77e349f5448ee61d11f3d88e3ff
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://cctraff.ru/123?utm_term=clam+crab+cockle+cowrie'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=clam+crab+cockle+cowrie In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc573b08787e879898a92f1/t/5fd215978185f4776a14acbe/1607603607973/air_traffic_controller_jobs_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dde4403f5353fd9590af/t/5fc1ce18f81c9a2a0ce488b5/1606536736020/37807572226.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf15364a3cc4058a3636d/1606218087435/webeju.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/leatherworking_guide_tbc_1-_375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e9609-fd08-4868-ae3c-d3dcd6e6d653/jamunuxutaramexosukifozog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8229831-bba2-4a80-8b1c-62a037c9605d/orange_county_notice_of_commencement_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7c26b3-d142-4441-a52d-e9ae0d8175f0/because_of_winn_dixie_mistake_tree_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703ef532-2231-4ab7-b8e4-2236f7385913/74538528774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cbc8bc-299b-4496-81f8-6be59e56a594/darden_direct_distribution_hanover_park_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d2bd11-a5b9-46ab-a603-617e85369056/matematica_para_quinto_grado_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44999467-fdd8-47db-9489-0996c5a89632/frankenstein_chapter_5-9_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ae4e1c-fdc4-4a84-87b5-0d87a9eb370d/99924110761.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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 4968 bytes
SHA-256: 1c513b93118978d5139e811f02f93a8dacd0525213310a625a5abb8b5c9de130
font_01_sfnt_off0000c34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34E 9780 bytes
SHA-256: d4f5ed28282c163d528f81c993fc31b2cd58699a4acbb4f21321a6ed2a40c652

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