Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b92b22a4936a7e8…

MALICIOUS

PDF

86.6 KB Created: 2021-06-07 01:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31a015c86036880bf14c53cf57e1080f SHA-1: 85580bc7f4584666170b335b8aa195ae8efcf73c SHA-256: 8b92b22a4936a7e878a4fa0dbea6ba06fb04dc2a103e8669ba005d64d1beb6b0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to 'irlanc.ru/pbw', which is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'Mejores juegos android 2019 gratis', suggesting a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://irlanc.ru/pbw?utm_term=mejores+juegos+android+2019+gratis
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5ff64ebe082e3.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_60237189d60c8.pdf
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/1955c68a9bbd.pdf
    • https://mozipode.weebly.com/uploads/1/3/1/4/131437967/8680592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1be627f-2db0-4e24-bcc8-0e3784ff0f72/honda_hrx217_repair_manual.pdf
    • http://fodorafirig.pbworks.com/w/file/fetch/144475830/descargar_fl_studio_12_full_en_espaol_con_crack_2020.pdf
    • http://wufamazajo.pbworks.com/w/file/fetch/144560607/55359901230.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144453015/microsoft_office_2013_free_download_for_windows_10_64_bit_with_crack.pdf
    • http://pamotekegopa.pbworks.com/f/why_is_my_modem_flashing_blue_and_white.pdf
    • http://xuwajesorewo.pbworks.com/w/file/fetch/144655677/o_senhor_das_moscas_william_golding.pdf
    • http://pisaxolakek.pbworks.com/f/biddeford_electric_blanket_instructions.pdf
    • http://zogekinovag.pbworks.com/f/15630761378.pdf
    • https://uploads.strikinglycdn.com/files/34086688-758a-48cd-87aa-874e9f02fde4/68259372205.pdf
    • http://vadobadud.pbworks.com/w/file/fetch/144600699/18628799502.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144671457/59787421403.pdf
    • http://gufabewa.pbworks.com/w/file/fetch/144753084/xamibipimuvamamev.pdf
    • http://mosijiv.pbworks.com/w/file/fetch/144750843/52371307506.pdf
    • https://uploads.strikinglycdn.com/files/7ce51fd2-3b73-4067-baa8-b3b614110f18/whirlpool_gold_quiet_partner_iv_decibels.pdf
    • http://niwomif.pbworks.com/f/dadex.pdf
    • http://vowujepojez.pbworks.com/w/file/fetch/144566022/gibukesirasipujixonusini.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_off0001137c.bin
5e14f0ba5858607c139ecd9ba943bea5d9d905cc2a55de4ca313430083b278f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 5524 bytes
font_01_sfnt_off00012660.bin
d9e7dc82c8a4026033f461390d592da5a0da100be76ae353d20f50226c615235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 11944 bytes

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