Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37972fbee47c15c…

MALICIOUS

PDF

81.7 KB Created: 2021-01-23 01:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eb9a42110637a24038d2e96b566d7716 SHA-1: 822c237460417c9f1d8ae5e8fe3f6ff4bfe8e6d4 SHA-256: d37972fbee47c15c9f58e61cc1e8c4d123491c81f35fba8ef09eee7303d0ae8f
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded external URI pointing to 'https://leonvi.ru/123?utm_term=warren+wiersbe+old+testament+commentary', which is a strong indicator of a phishing or malicious download attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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://leonvi.ru/123?utm_term=warren+wiersbe+old+testament+commentary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ff68626893a9.pdfIn PDF document text
    • https://site-1176294.mozfiles.com/files/1176294/woodworking_guide_ffxiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fe52ed76e211.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/TgiigwT/zanizexepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5ff3a87496776.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/ibjePia/fantasy_flight_star_wars_board_game.pdfIn PDF document text
    • https://site-1250755.mozfiles.com/files/1250755/alteryx_designer_11__7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fc8545ea5550.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/bm49Shc/machine_gun_sound_effect_button.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5ff2d2e175933.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/gdmghH8/bigoxemutigipexinanilofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5fd876c0d913e.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/Yz2FLXo/62191742390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcef34d6ca36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5fc96eac2f030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xedovafimolodem.epizy.com/78936952548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 5220 bytes
SHA-256: bd8c9481a3d6ab85bf6207fb6e78c271d2d6a6cb07d753e3b0c4003025807943
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10388 bytes
SHA-256: a43d6e96726613c0c7ba74675e594598afe959dd3e4a13bd112c3e7dea2bbf9c
font_02_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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