Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da7e985d92a0aa1…

MALICIOUS

PDF

73.3 KB Created: 2021-03-04 03:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c5289e50f5ce7ea191ba392d775ef0f2 SHA-1: de425d952b3cd2c48f690cfc7172c71f122d8173 SHA-256: 1da7e985d92a0aa1c1fbd71028be1db67cd97e66cb5ef2d9efd1764fcfc36940
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure malicious links within a large number of seemingly legitimate but disposable domains. The primary malicious URL identified is https://midufefew.ru/123, which is likely used to host a phishing page or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=what+is+database+dbms+and+rdbms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424647/normal_600b71bb81dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_600b15e42c5dc.pdfIn PDF document text
    • http://mazafaka69pussy.online/crossy_crash_mod_apk_unlimited_moneyz1mns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5ff7c031aadb9.pdfIn PDF document text
    • http://natorg.fun/maxwell_s_equations_in_word_formb04v0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fde4230aa2ae.pdfIn PDF document text
    • http://gtomishebs.xyz/viper12as_datasheet0g1us.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_5fd73cd8e9f5f.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/hJgj5eo/subway_craft_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/bgjiAhh/10969419869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fdac36aac4fb.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/fTmheid/amc_fearfest_schedule_today.pdfIn PDF document text
    • http://ledy66.net/97038303362otpw6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeliganav.epizy.com/46067108030.pdfIn PDF document text
    • http://zelimasiropaf.epizy.com/46313916780.pdfIn PDF document text
    • http://xikusizaferawev.rf.gd/the_magic_tree_house_full_movie.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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 5184 bytes
SHA-256: f4b3add9d20c2248b7e209eef7255ab4e21b49a0358958953c1fa0575fbb0255
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10148 bytes
SHA-256: 93cc4d4839303f67b30915d84d9ef8f6eadcbd4076f2709762038cbaeeb8dcb3

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