Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4515740ae9b81c3…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 19:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cbf2444af77ebb396a02a41d84ceaec1 SHA-1: 694188e51aed60026c332ae24f48ece299709b15 SHA-256: c4515740ae9b81c363eb9762226882b96456e24e92e2a1cbe74896502b68522b
136 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be designed to trick users into opening a password-protected archive, a common tactic to bypass security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=6+sigma+black+belt+certification+online PDF link annotation
    • http://toteganutiv.66ghz.com/gonexagufedebetugaxojul.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/dfhgwie/83159484439.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/YJjagep/bikajati.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/hbphiia/weed_firm_game_grow_ops_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/hhihRje/73902479324.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/cii5vhg/auto_reply_email_outlook_2013.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/how_to_change_battery_first_alert_9120b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gewisetug/13105691913.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/jopekokur.pdfIn PDF document text
    • http://movedubeliw.epizy.com/56172207618.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/leonardo_dicaprio_girlfriends_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/neoliberalismo_en_mexico_unam.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/35645095662.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/38395850996.pdfIn PDF document text
    • http://kewumexor.epizy.com/dazzle_dota_1_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/malayalam_calendar_2018_october.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/practice_english_speaking_online_free_skype.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/ayyappan_songs_free_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/pentair_easy_touch_user_guide.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/arranging_numbers_from_least_to_greatest.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/vufabeso.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/cross_checking_two_excel_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/recognising_halves_and_quarters_worksheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5464 bytes
SHA-256: 13785497b965d36fecbe6ea01b2320299cfc5c5242f62e3893505ad690c3c0d5
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 11412 bytes
SHA-256: f1d6c3609786b1d7c00df26473422aca252a46e7eae4750f14a6b9a7767ef2e4

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