Malicious PDF — malware analysis report

Static analysis result for SHA-256 9184752dc43c58b9…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 21:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c04a1dfeb1e5dc6efc2b9b77442f5fec SHA-1: d6fee79d8ea550f50d37441219dd462710a5501f SHA-256: 9184752dc43c58b986b601d9fc031767be7f72ede9c7ecec24bc97617912d8d4
124 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically mentioning 'invoice or payment language'. The embedded URL, 'https://jacksth.ru/123?utm_term=peachtree+accounting+exercises+pdf', further supports this by appearing to be a link to accounting exercises. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/123?utm_term=peachtree+accounting+exercises+pdf
    • https://cdn.sqhk.co/fuzomorikat/gWavQqh/bootstrap_table_pagination_template.pdf
    • https://cdn.sqhk.co/mudemodox/nGthc6l/ant_er_firefox_not_working.pdf
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/fafe4f1.pdf
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6023300806ed4.pdf
    • http://sale50.pro/680213228439wtwx.pdf
    • https://cdn-cms.f-static.net/uploads/4475874/normal_600adb3c86df9.pdf
    • http://sputnews.com/mhra_guidelines_for_computer_system_validationbfrui.pdf
    • https://cdn.sqhk.co/sajixobuko/Yeid8BO/30420190951.pdf
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5fe31da93b4f3.pdf
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60254fffbc1b5.pdf
    • http://milanomoda.site/fogajaxik0e3l3.pdf
    • https://cdn.sqhk.co/mifaruzamexu/JhiCn3Q/tiles_hop_edm_rush_game_download.pdf
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/5200100.pdf
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/natepiwivusubiv.pdf
    • http://vizionsmc.net/29007471720lgbci.pdf
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600aa95fd9e31.pdf
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ffe4a6fd3c07.pdf
    • http://4kuhd.me/952894101507rjz7.pdf
    • https://cdn.sqhk.co/nunamarajop/fPQL8AB/likitapupilotevoxofade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosevud/11502160041.pdf
    • https://s3.amazonaws.com/lomiwexuva/can_t_hold_us_instrumental.pdf
    • https://s3.amazonaws.com/napoledunadigo/19380567604.pdf
    • https://s3.amazonaws.com/nitatotol/ge_dishwasher_repair_service_near_me.pdf
    • https://s3.amazonaws.com/rexogeguxosix/17477818626.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_off0000f3b7.bin
b689c1b88e32faf7a0f6c4788db990db4199035444eeee21e1a4928884e38140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 5456 bytes
font_01_sfnt_off00010648.bin
8c573b55e77d4d80f2a3b41ff4d87235b068a5f145943afd247c005f5aa67747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10612 bytes

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