Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffaa11909d5a351…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 18:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 817d8b3d8945afd4ee3a818e23b447df SHA-1: 2c76034ca01753cbfb1ea546cc424d2357929a88 SHA-256: 8ffaa11909d5a3518e6f6cc5e3b1fe1a86fd82bb3edd31e99d5932fbd9f89bb4
96 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, with a specific detection name indicating it's a phishing trojan. An external URI pointing to 'golowaki.ru' was extracted, suggesting a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the detection imply it's designed to trick users into clicking malicious links, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=pathology+of+copd+pdf
    • https://cdn-cms.f-static.net/uploads/4415740/normal_6027491a73c43.pdf
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fde2a001b180.pdf
    • https://cdn-cms.f-static.net/uploads/4454543/normal_5fea2e70492ec.pdf
    • https://cdn-cms.f-static.net/uploads/4374699/normal_600c82bfb0497.pdf
    • https://cdn-cms.f-static.net/uploads/4372983/normal_60508d60be771.pdf
    • https://cdn-cms.f-static.net/uploads/4497685/normal_60620068de48e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad4a3da7-a62d-41db-a79e-13f17e9bced9/john_deere_riding_mowers_prices.pdf
    • https://s3.amazonaws.com/napoledunadigo/tascam_portastudio_424_manual.pdf
    • https://s3.amazonaws.com/jifesu/wifi_connect_app_for_pc.pdf
    • http://tezuzatarezoz.epizy.com/parallel_perpendicular_and_skew_lines_worksheet_answers.pdf
    • http://taluzeze.rf.gd/natta_reza_kekasih_impian_video.pdf
    • https://uploads.strikinglycdn.com/files/5769d13f-2433-485d-a854-5529e589200e/apc_smart-ups_1500va_rm_2u_smartconn.pdf
    • https://uploads.strikinglycdn.com/files/7d8b936b-8123-4acb-b718-88ca0776ea83/zmodo_dvr_camera_system.pdf
    • http://sadakukozami.rf.gd/backorder_processing_in_sap_sd.pdf
    • https://s3.amazonaws.com/libusamagowuvo/13765725179.pdf
    • https://uploads.strikinglycdn.com/files/6b034b86-2fd7-479f-9432-59fa507d22f4/nabuwetiwi.pdf
    • https://uploads.strikinglycdn.com/files/3360a6a5-51cf-46b9-b1a4-4cd856db06e1/25249529213.pdf
    • http://zebepojeguxeb.epizy.com/50777663830.pdf
    • https://uploads.strikinglycdn.com/files/b2b4036b-bd07-48b8-bbbc-f2c53e5c1f88/60851551875.pdf
    • http://nureresew.epizy.com/3156870438.pdf
    • https://s3.amazonaws.com/jijari/98132069266.pdf
    • https://s3.amazonaws.com/falufusu/pajedotitumebuwupogu.pdf
    • https://uploads.strikinglycdn.com/files/20c3df83-26a1-4883-84ed-21a851878e45/tuluduwitemukisujiroxu.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_off0000f4e6.bin
14a8c2e841e85720155af53bc43db928880883a194fcc8625e6742dcf1108512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 5244 bytes
font_01_sfnt_off000106ce.bin
3bc88325488da95eb7f3f9b510234a926aea4d2f957fceebb348d85d217eb5fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10316 bytes

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