Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3f4ad1f297914e…

MALICIOUS

PDF

71.5 KB Created: 2021-03-09 01:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f6e68bb42603b006725c5d025d3a2cc SHA-1: 551652d8aaa6cfdcbff44b1a56905390f5b38574 SHA-256: 6c3f4ad1f297914eeffb6ef9e175091fd07cb80cf08426f32371fb526d574b2e
96 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 a critical heuristic firing for ClamAV detection. An external URI, 'https://midufefew.ru/wix?keyword=circc+study+guide', was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text that appears to be a 'Circc study guide', indicating a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=circc+study+guide
    • http://vakekaninu.iblogger.org/greater_than_less_than_worksheets_kinder.pdf
    • https://cdn.sqhk.co/revowemerem/hdhjgej/grand_harbour_water_park_dubuque_iowa.pdf
    • http://zujakupuk.22web.org/pemanorudiranewalaxusit.pdf
    • https://cdn-cms.f-static.net/uploads/4447626/normal_602718d714bf3.pdf
    • http://runepudojeb.iblogger.org/dedik.pdf
    • https://cdn.sqhk.co/xagaxubibiz/hijfkeG/mini_zombie_hawgs_wheels.pdf
    • https://cdn-cms.f-static.net/uploads/4381083/normal_60240fd882e84.pdf
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/jusagigowavut.pdf
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/6792323.pdf
    • http://titujewegefo.iblogger.org/17842982542.pdf
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/3030d3a4.pdf
    • https://cdn-cms.f-static.net/uploads/4405950/normal_604622c3e5176.pdf
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ff4396e5d5c0.pdf
    • https://static.s123-cdn-static.com/uploads/4368759/normal_60097cb71447b.pdf
    • https://cdn.sqhk.co/nomevagume/bJFhahi/ball_sort_puzzle_level_1453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://natadomemorad.epizy.com/backflip_madness_android_game_free.pdf
    • http://ribowiga.epizy.com/b_m_sharma_mechanics_1.pdf
    • https://s3.amazonaws.com/moduxanakuri/1183105056.pdf
    • https://s3.amazonaws.com/nemafu/manual_bmw_x3_2016_espaol.pdf
    • http://sidijujaz.epizy.com/dabinilupofamavogulibabe.pdf
    • https://s3.amazonaws.com/lorugipopuxe/avast_antivirus_offline_2016.pdf
    • https://s3.amazonaws.com/zesotat/17699796408.pdf
    • https://s3.amazonaws.com/libusamagowuvo/pillars_of_eternity_2_deadfire_dlc.pdf
    • http://mivoxonewume.rf.gd/present_perfect_already_yet_exercises.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_off0000dbd3.bin
9afabd9bceb23178f7244a730a3bdebbfc4d4a28d8768f96e64f76d7636e79ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 4872 bytes
font_01_sfnt_off0000ec78.bin
bb3babae3c132383b0dac9ac548e45152fa8e5c1748cc048f0d58ad49635abf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10560 bytes

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