Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d25a612fd3b1ae…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 08:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41aedef54f661905a554cbe11f8f4421 SHA-1: 21c02fb316b69972a2cf95e2ef52c43df531893d SHA-256: 10d25a612fd3b1aef15043cd7456ddb0edb2b8ba11e06921ad9abf74578a4a92
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a tactic to obscure the ultimate destination or spread malicious links. The PDF structure and embedded content, though partially obfuscated, point towards an attempt to redirect users to potentially harmful websites.

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://kuzutuzo.ru/123?utm_term=les+miserables+sheet+music+book+pdf+free
    • http://ribadubeko.scienceontheweb.net/mifubuta.pdf
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/zoxax.pdf
    • http://anstel.pro/junit_reporter_karmal22jl.pdf
    • http://zonizubiro.getenjoyment.net/nelonuwef.pdf
    • https://cdn.sqhk.co/gugexuje/jfgj8gh/word_wars_word_game_apk.pdf
    • http://soldonlittleton.com/231469529992c0gu.pdf
    • http://nakekizedexu.getenjoyment.net/41401735382.pdf
    • https://ribiridoxa.weebly.com/uploads/1/3/0/8/130874248/66428a9545.pdf
    • http://powajaxib.medianewsonline.com/how_to_respond_to_a_good_review_at_work.pdf
    • http://straponartist.com/algorithme_de_triexsi9i.pdf
    • https://cdn.sqhk.co/bikegola/ejdqDjh/rimegekibiwu.pdf
    • https://cdn.sqhk.co/dolafita/njeibif/zafinutemalitesudo.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/9884536.pdf
    • http://help-copyrightservice.xyz/masterchef_dessert_kingphhbu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tirinito.epizy.com/25126530380.pdf
    • http://sinusisokopex.atwebpages.com/who_owns_lawn_boy.pdf
    • http://purevaxa.epizy.com/jemuzaroluvusanal.pdf
    • http://nobajasasoda.epizy.com/kasidanezujesurir.pdf
    • http://muduwabu.rf.gd/fiction_sumika_piano_sheet_music.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_off0000eca1.bin
d6a9eb759611089e54fc9b5d3c157a3112b43a4874aafc6cf2810e46b8530b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 5540 bytes
font_01_sfnt_off0000ff44.bin
b99060b9bc8552bcea4d142ee6df21af8b3928bd0a5cf098c178ddfa0a36f488		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 10672 bytes

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