Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a1f7c08760adb5…

MALICIOUS

PDF

115.8 KB Created: 2021-04-06 09:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22d6eac128a1a7277eaead57aa0e4ca SHA-1: b1d166b012c8c27d2af15d89117bbf0ebdae20f7 SHA-256: 42a1f7c08760adb5808f347a2df9dc29f8decdb2e4367593231e74e8d0bd0fa9
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Hungarian verb conjugation rules' which directs users to a suspicious URL. No scripts were extracted, but the presence of embedded URLs and the overall detection profile strongly suggest a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://nipisod.ru/strik?utm_term=hungarian+verb+conjugation+rules
    • https://cdn-cms.f-static.net/uploads/4401712/normal_605c92950c07c.pdf
    • https://cdn.sqhk.co/naveropifo/8jamLib/wuxesukonelonej.pdf
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/rozijubibokibo-fitogotod.pdf
    • https://cdn-cms.f-static.net/uploads/4375889/normal_602756a646b82.pdf
    • https://static.s123-cdn-static.com/uploads/4369143/normal_5fff7d2d87616.pdf
    • https://cdn.sqhk.co/lesebonun/xiaicFy/givepumuwibuba.pdf
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/176520.pdf
    • https://cdn-cms.f-static.net/uploads/4385863/normal_6044d0e06aed1.pdf
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/9708258.pdf
    • https://cdn-cms.f-static.net/uploads/4465707/normal_601a03cb6d72a.pdf
    • https://cdn-cms.f-static.net/uploads/4390097/normal_601fd632bc238.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0097f5d2-095d-498f-be5e-cff4a84cf678/reading_strategies_posters_and_bookmarks.pdf
    • https://s3.amazonaws.com/tikofaketonub/60858460381.pdf
    • https://uploads.strikinglycdn.com/files/ad04e04b-b6f4-4f30-b390-768b99538b2a/tasco_game_camera_at_walmart.pdf
    • https://s3.amazonaws.com/bidivo/6478065809.pdf
    • https://uploads.strikinglycdn.com/files/cae33c82-cdfe-4792-a793-474667c17094/siemens_plc_programming_tutorial_for_beginners.pdf
    • https://s3.amazonaws.com/palikuvexake/93826385800.pdf
    • https://uploads.strikinglycdn.com/files/a95f41c0-104d-4b78-be39-7ee7afc7055f/8688419716.pdf
    • https://s3.amazonaws.com/zizene/fiduxivuluwedigev.pdf
    • https://s3.amazonaws.com/lijulijowivaze/flight_simulator_pc.pdf
    • https://uploads.strikinglycdn.com/files/e6a321d1-4f27-4be8-912c-6ff5ecb38b5c/pepopoxipopabedopiwik.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016dac.bin
d83ac3b23282ec6d5092a6e75d19473559510d24be5d57b96d410b700cbece8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAC 5204 bytes
font_01_sfnt_off00017f7b.bin
b314d41602a7649e368a531580be0025ead72a1156ad8d8547b4ad97f2b75b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F7B 14240 bytes
font_02_sfnt_off0001ac50.bin
d7ee14f66ae469d8303d1ef74a296899217b66f363d3cd81a177c3917d221563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC50 16244 bytes

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