Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25846eca3cc53aa…

MALICIOUS

PDF

77.6 KB Created: 2021-05-31 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0a645971216343979f1abf1e7182837c SHA-1: 374eb368f4119e2a8ea5cda1c85e98cfe6c00d26 SHA-256: b25846eca3cc53aaf46a9fbf1842cb82b3b8896dae24d772fe4e555af658e9e1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, one of which, 'https://medvor.ru/pbw?utm_term=brawl+stars+avengers+mod+apk+indir+2021', is presented as a lure for a game mod. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=brawl+stars+avengers+mod+apk+indir+2021 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5ff3210a1262d.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/2065890.pdfIn PDF document text
    • https://milorupubi.weebly.com/uploads/1/3/4/3/134317418/wokuwarofofawiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_606d68983e5eb.pdfIn PDF document text
    • https://kibugaduxabe.weebly.com/uploads/1/3/4/5/134510017/tukasesedodude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_603a785d174b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385021/normal_5fe3d8ee463a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fee13882acc7.pdfIn PDF document text
    • https://kusumuwuwudes.weebly.com/uploads/1/3/4/3/134338751/4678313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_602802ea650dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_603d294d05af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_6031e41766111.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
    • http://wuxikadafi.pbworks.com/f/zefofobevakatifuwevix.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/stick_fight_archer_mod_apk_unlimited_money.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/ikea_luroy_full_bed_frame_instructions.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/maxefujoja.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144423546/71954007477.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/tewubaxuwi.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144424044/english_file_upper_intermediate_students_book.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/grille_salaire_secrtaire_mdicale_2020_fonction_publique_hospitalire.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144411852/pagezoxevisizab.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 5660 bytes
SHA-256: 5c6ed9a09c9fb8d1e19b845b6b6ad04c5c85db16d6e1050c6a10eb41a00a4b09
font_01_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 12196 bytes
SHA-256: e6f6ce1dd11adcb1070686e842a34075361783c1d11003a795d81169f87bf8a0
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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