Malicious PDF — malware analysis report

Static analysis result for SHA-256 364cd833d85ed766…

MALICIOUS

PDF

174.8 KB Created: 2021-03-03 11:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a0878c1c9cc11c49873ad04c738252a SHA-1: 9a1d8d0f62c9ca0fb65f15bd3ee99684983cd213 SHA-256: 364cd833d85ed766100abbed80c8c89f5bdce3e3f004ca79d7a1bbbcd5d78e7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'zajinet.ru' and flagged as an external URI. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links to disposable hosting, suggesting a link farm designed to obscure malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body, though heavily obfuscated, contains keywords related to games and application versions, potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/wix?keyword=league+of+angels+fire+raiders+hacks PDF link annotation
    • http://devlp.club/tilumanobamawoxowatuxigom5u99u.pdfIn PDF document text
    • https://cdn.sqhk.co/mubasetopagu/cghcjgi/escape_alcatraz_game.pdfIn PDF document text
    • http://lojasamericanasbr.com/zoduzomupegiwezaxrzat1.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/ajcg4SA/jujonirafeguwemizi.pdfIn PDF document text
    • http://uspeh.icu/50199888097hvk6u.pdfIn PDF document text
    • http://mavitrade.com/33382707484aqb89.pdfIn PDF document text
    • http://pobegikobej.iblogger.org/85408400954.pdfIn PDF document text
    • http://niwobupiku.iblogger.org/zabibadigiralitek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonenutekosut.epizy.com/sql_tutorial_advanced.pdfIn PDF document text
    • http://fatugogav.rf.gd/10889585015.pdfIn PDF document text
    • http://nozaleb.rf.gd/54030754914.pdfIn PDF document text
    • http://pamemoroza.epizy.com/bojulovivowipipunifemid.pdfIn PDF document text
    • http://punegejofuj.epizy.com/factual_report_about_wasps.pdfIn PDF document text
    • http://rakejobik.epizy.com/77329774182.pdfIn PDF document text
    • http://fapabuzoliwesaz.epizy.com/50430034823.pdfIn PDF document text
    • http://kuwopugivowivo.rf.gd/77905165623.pdfIn PDF document text
    • http://wozaloruwogilo.rf.gd/marvel_future_fight_epic_quest_guide_deadpool.pdfIn PDF document text
    • http://zasidad.epizy.com/74785949942.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_off00027759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27759 5288 bytes
SHA-256: 3ac0c62995f9946b8bb688c0819a59bf09198c3849e0e88369e8db2b5bb18f36
font_01_sfnt_off00028959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28959 10472 bytes
SHA-256: 56e5a206db098174fe965dbcb55d24ee598b8f285f85bf4f59ad805014d38721