Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e53156ccbae4f94…

MALICIOUS

PDF

81.0 KB Created: 2021-03-29 14:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 16e805b6029cd8b22072bd339e3c3617 SHA-1: dedffc490d8ba934d7fc3834a0eb3057018814cd SHA-256: 8e53156ccbae4f94b1d14946c7c6a68d306c0aa05742d15045e72f9f12c38d4b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/award?keyword=beyonders+seeds+of+rebellion+pdf PDF link annotation
    • http://fizarumokugafu.mywebcommunity.org/juwelajukaki.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/narufatijen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_602e44de3e93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601f5332b840d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_6050e5d01be17.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/IMwAhjK/world_war_2_books_for_young_adults.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/38804788823.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/idRFlJ2/indeed_project_management_skills_time_management_assessment_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_6015bc1384129.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/elements_of_writing_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/giRc8dh/rinulezavinadaluweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_60196cae0a8a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/irYggif/calendar_days_calculator_nz.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/82835801110.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/what_is_textured_ceiling_called.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6035a0dc68b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd7d20770516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_60602a37705f4.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/1YiCtjb/kuzakejexubunivisedog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_600a0e6be1092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_6061b24fd2031.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/ViaSgdU/sql_server_2012_r2_developer_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/pidenali/pFjgTtW/box_office_records_all_time_wiki.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://nitubak.atwebpages.com/arbitrage_hedging_and_speculation_the_foreign_exchange_market.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/fuxenugodopulinamadibuk.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 4824 bytes
SHA-256: 69a832e89d0eccc85284733186bd4a9ca730e43861f817a1d0b356b5c047f4b5
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 10140 bytes
SHA-256: 2fbd17d7fcafbeb0a4a29fbef87c9103b26834bd52bc21a72de4c70f8d28bc4e
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378