Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af74c4bd076c94b…

MALICIOUS

PDF

71.0 KB Created: 2020-12-01 23:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec2fbdf96fc1f7e00ab702f80cff1b6 SHA-1: 1c2d07842541d72eb5edf22d0d061b78e231ea7c SHA-256: 8af74c4bd076c94b0134d2b545273b1260247b15ac2e56c577d133f4968897eb
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a PDF link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a content-luring strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=2006+honda+civic+radio+wiring+harness+diagram
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f9be405c8f03.pdf
    • https://bupuxikamofimap.weebly.com/uploads/1/3/4/7/134734142/nurajovajazuk_menukezemet_veraxojat.pdf
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/a624b70cf81f.pdf
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fbb0bfacea17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f57be78-bce6-47e3-ad13-e046ddd1a4bd/lesson_plan_speaking.pdf
    • https://uploads.strikinglycdn.com/files/a9202958-a9af-4e0b-9071-4faad336108b/79821278366.pdf
    • https://uploads.strikinglycdn.com/files/6ebacb88-516b-4c3c-b71d-710298ed011f/65299962645.pdf
    • https://uploads.strikinglycdn.com/files/94c2b70e-852b-4f2b-9ffe-0ce47e27e4fc/59189819509.pdf
    • https://uploads.strikinglycdn.com/files/a21f7ccf-8aa9-4d4b-a929-fe325a48508b/96478533025.pdf
    • https://uploads.strikinglycdn.com/files/0cfb9c53-78a1-432e-a60b-8505626785a9/gta_v_download_apk_pc.pdf
    • https://uploads.strikinglycdn.com/files/c9b95d0d-6b10-4f7b-ab09-81913c9bdff9/dayton_3z918_drill_press_parts.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_off0000d635.bin
b7ae825312a4600cd551154e51ec4f883f6cad48672fc1464dbd63ecde8e27c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 5808 bytes
font_01_sfnt_off0000e9e6.bin
0632eb15d054b6efcdc163b5c263663d8e56bf8002b6cbfa1b5de32881b31d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 10896 bytes

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