Malicious PDF — malware analysis report

Static analysis result for SHA-256 0add147ef74bdc89…

MALICIOUS

PDF

73.6 KB Created: 2021-04-04 06:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae8ff1643c6df4edef8d3fac77c03117 SHA-1: 9a68c9562c3be53951133cd70cdcbf007e554a61 SHA-256: 0add147ef74bdc89c32b74fc644dbc5d4a07707d1a9b9c501c3cd3583b8afd67
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to IELTS preparation materials, which is likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=makkar+ielts+speaking+book+pdf+september+to+december+2020
    • http://lg-copyright.com/install_adblock_for_chrome_androidjwgsi.pdf
    • https://rekizutor.weebly.com/uploads/1/3/0/9/130969391/7232451.pdf
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/nokuxarafe_sakozovus_vapawaboxanosi_kibapug.pdf
    • https://tekolukab.weebly.com/uploads/1/3/4/8/134853049/zuropaxibagu-sajewuzokeman.pdf
    • http://remastacer.com/551774000958kdiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gagotaniwipure/nusonabonemomurufigaf.pdf
    • https://s3.amazonaws.com/nafamaragisek/fepif.pdf
    • https://s3.amazonaws.com/gazijewevan/robert_monroe_institute.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_3962372635f54527aada991add933943.pdf?index=true
    • https://s3.amazonaws.com/nodetuxapabara/99032106458.pdf
    • https://s3.amazonaws.com/xovajukoxin/captioning_and_court_reporting_alis.pdf
    • https://s3.amazonaws.com/lodazojamuva/in_vitro_disulfide_bond_formation_protocol.pdf
    • https://s3.amazonaws.com/pasawexawinogad/fapamuxexe.pdf
    • https://s3.amazonaws.com/metubevozisul/hammerson_plc_annual_report_2017.pdf
    • https://s3.amazonaws.com/simujix/field_instrumentation_interview_questions_and_answers.pdf
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_3cc5f49b20d14a6f99e041623ac1f00a.pdf?index=true
    • https://s3.amazonaws.com/jepinebawo/34026171242.pdf
    • https://s3.amazonaws.com/xeroguru/35534132481.pdf
    • https://s3.amazonaws.com/zetituri/tarupenupigozepewenes.pdf
    • https://s3.amazonaws.com/dibedamoka/men_s_saucony_everun_guide_9.pdf
    • https://s3.amazonaws.com/setigafat/lanopojaxidexuwixi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ff.bin
8d75c0151f1cd85076f83fbd30c2247bc0c72549652041e329ca44974a9af914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 5960 bytes
font_01_sfnt_off0000fc41.bin
2fca2058e3304a018891d72703f2b9b98e7eb644e348abec3dac2aba14ca7e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10200 bytes

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