Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a1f28e56081381…

MALICIOUS

PDF

78.2 KB Created: 2021-04-24 17:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5730df34eba938f7464b3328b8a909e5 SHA-1: def4771728a63850beaba90c15401dc3339a38f5 SHA-256: a3a1f28e56081381c02d4128a46e06add31f3b6f95498d1a9b24e2aa9c681971
96 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with the latter specifically flagging it as Pdf.Phishing.Trojan. An external URI pointing to 'vilenefex.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'tuesdays with morrie quotes with explanation', which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vilenefex.ru/strik?utm_term=tuesdays+with+morrie+quotes+with+explanation
    • https://cdn.sqhk.co/sexifirume/j3dqQif/robot_fps_shooting_games_fps_counter_strike_game.pdf
    • https://cdn.sqhk.co/rifarako/gxEPhhP/wogajojakedimozufaligu.pdf
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fcc62d3d020c.pdf
    • https://cdn-cms.f-static.net/uploads/4479214/normal_5fd6d10cccd59.pdf
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5feb287785570.pdf
    • https://static.s123-cdn-static.com/uploads/4457332/normal_5ff97ed89d61b.pdf
    • https://cdn.sqhk.co/xekemini/9x5HQRi/bedwars_minecraft_map_download.pdf
    • https://cdn-cms.f-static.net/uploads/4409628/normal_60240d7a8284d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bemerolafun.epizy.com/37853995979.pdf
    • https://s3.amazonaws.com/gafedupeba/information_security_awareness_traduzione.pdf
    • http://povuputuk.epizy.com/wapatavotimemukov.pdf
    • http://poziluxolebulu.epizy.com/62722580512.pdf
    • https://uploads.strikinglycdn.com/files/445731d7-44c5-4c6e-9a56-0b035558b8ba/bokomiruzaveminaxozatobu.pdf
    • https://uploads.strikinglycdn.com/files/33376a08-fc4a-4d57-892e-509a33cac6d8/58396449781.pdf
    • https://s3.amazonaws.com/jotizifime/conversations_with_god_book_3_quotes.pdf
    • https://s3.amazonaws.com/fojaxexino/audit_report_format_for_trust_2019.pdf
    • https://uploads.strikinglycdn.com/files/07c6b82b-3c92-4d26-8ec4-cfc0761fe2cf/38571306408.pdf
    • https://s3.amazonaws.com/xonaxevetaf/brute_force_app.pdf
    • https://uploads.strikinglycdn.com/files/ffb759c3-7416-4228-abd2-2dac9299446c/how_to_setup_tp_link_tl-wr841n.pdf
    • https://uploads.strikinglycdn.com/files/4b6bee79-25dc-4a02-bf43-87fdd565b828/how_to_describe_morning_sunlight.pdf
    • https://uploads.strikinglycdn.com/files/ae91bafa-b438-4685-85c3-c667503d96dd/easy_piano_songs_sheet_music_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/0e1598ba-55d1-46a1-9c79-9079ebf6e3d7/how_to_find_the_surface_area_of_a_square_formula.pdf
    • https://s3.amazonaws.com/zozofufulolig/sugizonilu.pdf
    • https://uploads.strikinglycdn.com/files/f5db447a-7eff-47bf-b975-7882a48b1a50/daviriwemedemipimu.pdf
    • https://uploads.strikinglycdn.com/files/ac8ad8a1-6dae-4d48-90a8-13bcbe75737e/cuales_son_los_sintomas_del_cancer_de_estomago_avanzado.pdf
    • http://mofagadelebedos.rf.gd/56930546330.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_off0000f3ac.bin
2477a39cda712b4d10c767a2c9312869d2d25cf04cbee9fe8529eb95dbd01868		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 5536 bytes
font_01_sfnt_off0001066c.bin
2cbcd825b9c866d505a61d403db570eeb7bd5f741c10e5244b089d8e901b5397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10716 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.