Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48ed72fc8419d9f…

MALICIOUS

PDF

73.2 KB Created: 2021-03-13 18:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c990c9aa1537b0142755e5480d37b096 SHA-1: 86cbb12cf636c1b3efb0a23b597a14521a96fd84 SHA-256: c48ed72fc8419d9f74b1b92473f0d6d7a445d4ecc059f5ebc7b6ab0faa0b953f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is structured to maximize link exposure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=when+we%2527re+together+the+sun+is+shining PDF link annotation
    • http://zozomerolam.22web.org/8604437474.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/irgcHhb/16250436789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_600fcabc71126.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/egf28io/98483003621.pdfIn PDF document text
    • http://xanarixumafiju.iblogger.org/gumerur.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/jMjethc/xapitigugatutivozenidaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mowaxuso/hi16hjw/dewiginut.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/dhj7jhT/heroes_and_merchants_rpg_max.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/jcibaia/2d_car_racing_games_free_download_for_pc.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/4490949544.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/ggUY5hh/street_of_rage_4_full_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5ff8b7a60d14e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_604893d7d9522.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/EhbXiaF/winterhawks_skating_center.pdfIn PDF document text
    • https://cdn.sqhk.co/fokivetezabu/gdjg4jc/6309589305.pdfIn PDF document text
    • http://bugamuwilozibil.22web.org/peter_drucker_quotes_on_leadership.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_60070d005b55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_600bc66112824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/likerajatob/sundara_kandam_reading_benefits_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/eureka_math_answer_key_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/lamatapagafedej.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/49280604073.pdfIn PDF document text
    • http://biwuwilanu.epizy.com/mufoxabemugoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/que_es_placenta_previa.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/675802407.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/tosedukularozara.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/laplace_m_asura_skill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/lisaziwajok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 4724 bytes
SHA-256: f4eedb52c0cbb5f315041b119617f676aaf4c5fb896bd7c9082d8541cbfcd5d7
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 11360 bytes
SHA-256: 92e83c3b9cbe9a4ac0ea4b7cbd4cde6c3fc0f1d89516cff6f38c67067d559fe9
font_02_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3