Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a78ce9c849dc18b…

MALICIOUS

PDF

87.6 KB Created: 2021-03-01 01:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2f1f14df1d5bc2f585963ef99a34a02b SHA-1: c534b01f44a44351dcd6733c58014e65cc10b16a SHA-256: 8a78ce9c849dc18b855f135d4832f3b7e9520730860671af096cc6cb26bf95b2
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many of which point to disposable hosting or link farms. The document body, though heavily obfuscated, contains metadata suggesting it is masquerading as a Samsung Blu-ray player manual. The presence of external links and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=samsung+bd-h6500+3d+smart+blu-ray+disc+player+manual PDF link annotation
    • http://educationonline.website/jowavvbqjn.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/metamorphosis_by_franz_kafka_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/hpNcq0C/96286712812.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/9759714569.pdfIn PDF document text
    • http://artyom.guru/great_by_choice_chapter_6_summaryd7s14.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/Drecie4/f1_racing_tv_schedule_usa_2019.pdfIn PDF document text
    • http://migriruy.ru/36966607031mjtd6.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwikiza/XejdjjM/22769752948.pdfIn PDF document text
    • http://bellissimo.online/nuverojuwinol2ka1.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/46992766012.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/jokXhbv/butegiwojijikodikogobam.pdfIn PDF document text
    • http://tomogorman.com/hookah_bar_dj_mix_song3ol83.pdfIn PDF document text
    • http://braco.ru/buwulibetiwonejedixeric6md5.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/farming_simulator_2015_xbox_one_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nigojelur.epizy.com/newest_best_android_puzzle_games.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 6448 bytes
SHA-256: db57a4bc448dda49de2fb2dc908dd8b2c2bdcef6a14d40b024d148be9daea16d
font_01_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10608 bytes
SHA-256: 224b7dee3ebd63537b25755eb2c1a1ab48fdd86a7cdd89b173012a0f1dd6ac61

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