Malicious PDF — malware analysis report

Static analysis result for SHA-256 573733da11e57848…

MALICIOUS

PDF

110.8 KB Created: 2021-03-28 01:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8a0585094ecfcbc5d979673c34c2969e SHA-1: d23dc4c379f9a2e329e0d76790468f87be89f090 SHA-256: 573733da11e578480298de58396aab8caaf29c51ba2b4ba49623b382317ce70e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs, with one prominent URL pointing to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=bioterrorism+seminar+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427295/normal_5ffba6bc2df21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5fe740666a159.pdfIn PDF document text
    • http://gitaxodepa.iblogger.org/64775958215.pdfIn PDF document text
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/mowubuwadubi.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/KgijbwC/tawewixirin.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/9JgcK2h/28966512957.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/605dba2718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_605b88bebc49b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/faxojofenerejujapuzexitok.pdfIn PDF document text
    • http://mezezix.rf.gd/30954507058.pdfIn PDF document text
    • http://voparidogavov.rf.gd/comptia_cysa.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/bodoni_72_oldstyle_book_font.pdfIn PDF document text
    • http://dexegudev.epizy.com/tesijuxidovolizo.pdfIn PDF document text
    • http://muzokezebo.rf.gd/blank_calendar_january_2020_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/business_english_vocabulary_cambridge.pdfIn PDF document text
    • http://korobuvorudetiv.rf.gd/sasafoga.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/lesekuripebotodirex.pdfIn PDF document text
    • http://sakuduma.rf.gd/the_shining_book_vs_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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17804 5204 bytes
SHA-256: adcae0211585ad4fef525c015bf84374f6d6821ded2a9b5c3dfe8bf13ff47e6c
font_01_sfnt_off000189a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189A1 10820 bytes
SHA-256: f75a37c1de95c6ac086048aec02d4792513972588c007ef4d3901dd5675bc94e

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