Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f58c0c9230fee9…

MALICIOUS

PDF

72.7 KB Created: 2020-11-16 23:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfec3e85ad5afe5336060482290d21a7 SHA-1: 13492d484723fa68d07402fd5aab54dab12bdb07 SHA-256: 78f58c0c9230fee90b5ee71b86ad7a56a4d74797ae177609cb27203d40c655e4
154 Risk Score

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://gettraff.ru/123?utm_term=history+taking+in+internal+medicine+pdf'. 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 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=history+taking+in+internal+medicine+pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f9fac4635c84.pdf
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5fada1b7416b9.pdf
    • https://cdn-cms.f-static.net/uploads/4387816/normal_5f977f23cafde.pdf
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5fa4144ba435f.pdf
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5fab5f6fe4ef6.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f94cca9cec70.pdf
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5fb27e565552a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kijelopazekune/pdf_annotator_mac.pdf
    • https://uploads.strikinglycdn.com/files/46de11e1-84ad-456c-ad77-d548ec95918b/sd_maid_pro_revdl.pdf
    • https://s3.amazonaws.com/poresi/algebra_1_regents_january_2016_answers.pdf
    • https://s3.amazonaws.com/minaxigevani/patriot_properties_westborough.pdf
    • https://s3.amazonaws.com/xalexojaxipud/unidad_2_etapa_2_answer_key.pdf
    • https://s3.amazonaws.com/zarusegibitumet/bunoxosazuzowaf.pdf
    • https://uploads.strikinglycdn.com/files/8709dc27-7ca0-4be2-be78-11456c7d1fa4/wenonofubuxamolenevakaza.pdf
    • https://s3.amazonaws.com/pasawexawinogad/64845376522.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_off0000dfd5.bin
b9146a157ee42658a8cdc5848cd764eb7c8d093de0f64215a489a41d1200b26f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 5604 bytes
font_01_sfnt_off0000f2db.bin
8e88660b25b9df772879a8ab3dfc010cb9777a14d0557b45c41ddea140dfe321
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 10236 bytes