Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac65cf2ea632aef9…

MALICIOUS

PDF

80.6 KB Created: 2021-01-15 06:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0f9da867e44683a8a123f201c52cb08c SHA-1: 9404c4c5741e26e62c3a20ad60bc38bb109d970f SHA-256: ac65cf2ea632aef94df381749cce1430c8d861eb13ffce83bc5056dcc293ba47
104 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI and a visual download button. The embedded URL, https://traffnew.ru/aws?utm_term=biological+science+7th+edition+pdf+free, is likely intended to deliver a secondary payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?utm_term=biological+science+7th+edition+pdf+free PDF link annotation
    • https://site-1176681.mozfiles.com/files/1176681/37442980248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f89a3d879c16.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/zHHQibR/loopers_the_caddie_s_long_walk_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_5f93bc705ae13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f927b5954c72.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/Ejzhegj/38047102762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5ffff5b2498cf.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/iejij1t/81427910513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f88846c39373.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/ibJzOhi/12759740449.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/Hhgjjnx/soft_serve_ice_cream_truck_rental_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/1heBiaA/korean_pop_music_videos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fe54f744b25e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f99160fc7c12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 5544 bytes
SHA-256: 725cd2a006c8461f8ff71f0ecba7e4160a0497f5e12400550f74c4ebb8767dfd
font_01_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 11108 bytes
SHA-256: 7abc2b0034701f4e706530974d62c558957572542183301357abcaceabf8f4cc

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