Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebcd0ef24ba768f…

MALICIOUS

PDF

79.0 KB Created: 2020-12-29 23:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9b893da247e77f26b7fa8b0be0e07cb1 SHA-1: ea26d880cf7e554048332b5023b97e320ec87979 SHA-256: 5ebcd0ef24ba768f65215a126cc2113077bd720d79aba0319674944910bc772a
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=regression+discontinuity+design'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a compromised site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=regression+discontinuity+design In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f953d59adde4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369138/normal_5fe5995bbafc5.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/LhiUKtV/46491573272.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/VW7Uwa2/dice_roll_dnd_5e_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/bgSBRge/41560391533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fb50bf27aa49.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/eaievhi/bugsy_drake_sister.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376369/normal_5fce4890b606c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votawawo/cartoon_network_schedule_for_november_1992.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/xobopawod.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/eviction_notice_florida_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/panasonic_blu_ray_remote_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/kilenikujuduga.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_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 4976 bytes
SHA-256: c617951d64731ed1a8a7d20da7c6ea8e54577efb9c18615cce07bc1e2b9650b7
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 10088 bytes
SHA-256: d6e44aa2444ad79c1126c09b616040fc0318986406fea716f033b32e50aefa3e

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