Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98d8467d4da58d0…

MALICIOUS

PDF

85.9 KB Created: 2021-02-28 17:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7022b7f3651915f4b67dac5c422b9eea SHA-1: 13de5ad1375711d67f83f37e0f1cfd7d17791ef6 SHA-256: c98d8467d4da58d0c00c0adcf924af91f61752a5781608dbf0b4717f882eeb87
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL https://xezojetit.ru/123?utm_term=finnegans+wake+restaurant+and+pub is a primary indicator of a potential phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL usage suggest an attempt to redirect users to malicious content.

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://xezojetit.ru/123?utm_term=finnegans+wake+restaurant+and+pub
    • http://reactivaperu-viabcpi.com/acronyms_initialisms_abbreviations_dictionarytr6ii.pdf
    • http://bilkan.fun/fogebepeliserunikufetirar9h9g.pdf
    • http://detonic-shop.website/watch_annie_online_free_1999w7rsk.pdf
    • https://static.s123-cdn-static.com/uploads/4452169/normal_5ff9ceb3ef1f9.pdf
    • https://cdn.sqhk.co/niririga/hdI9hc2/history_of_medieval_knights.pdf
    • http://burovaboxesomu.iblogger.org/75535512781.pdf
    • http://white-x.fun/6003448407a9oty.pdf
    • https://cdn.sqhk.co/guvelebul/hIgiria/jegigefepofiwuzanonagi.pdf
    • https://cdn.sqhk.co/sewizefaxiki/geN2hhm/lego_marvel_super_heroes_2_deluxe_edition_review.pdf
    • http://espaceabone.com/4936123380336yt5.pdf
    • http://olivamebel.com/single_player_card_gamest9wx6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nisugaraxefubo.rf.gd/51015767858.pdf
    • http://zupotid.epizy.com/beginners_guide_to_game_streaming.pdf
    • http://sanaxumidi.epizy.com/kuzebukebetebumoxakugugen.pdf
    • http://tuwutexo.onlinewebshop.net/can_i_mix_perlite_with_cement.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_off00011286.bin
f6efe8000a3097092200992a6ecd04e76f80093b34bac4c0f232fc5a197d9df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 5344 bytes
font_01_sfnt_off000124d9.bin
5620c2974f59f1149909c999590d99e710a81d56eb496c61b7b2f6a297b189f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 11268 bytes