Malicious PDF — malware analysis report

Static analysis result for SHA-256 f058625f9b45ac47…

MALICIOUS

PDF

72.8 KB Created: 2021-02-19 15:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a1efff663d88dd8f7e335374cd199f5 SHA-1: 4472f3f2f107e3c822541c022998f8fb91bcdc59 SHA-256: f058625f9b45ac47dc5ee0dc5d8984083de02566294ad5ae85200846fc80efb7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to search terms and application names, likely intended to disguise the malicious nature of the embedded links.

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://jacksth.ru/strik?utm_term=prince+caspian+book+sparknotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5ff4a2128f0ea.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/86b8e.pdfIn PDF document text
    • http://xesabuzusoneb.66ghz.com/anglicanism_questions_and_answers.pdfIn PDF document text
    • http://tihefers.online/alien_vs_predator_juego_arcade_para_androidx18s9.pdfIn PDF document text
    • http://titanof-filtr.ru/best_movie_2018_hollywoodjgl3o.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/9bb8fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5fc8512d56840.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/rabumageruxa.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/iijjjge/86047469141.pdfIn PDF document text
    • https://pidolanapeg.weebly.com/uploads/1/3/0/8/130813957/tigovamozixuno.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/1004575.pdfIn PDF document text
    • http://com-copyrighit.com/18188547729ozssx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tonaxoguzigep.epizy.com/zufisa.pdfIn PDF document text
    • http://nenilezum.epizy.com/wakevejojuwitebewo.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/bebewovujexex.pdfIn PDF document text
    • http://fegidil.rf.gd/xukewovivotavimeta.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/anthrax_bring_the_noise.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 4888 bytes
SHA-256: 4aad322a2d424687274f052580e38b71f262f01754c30aeb3fcce6d9e03d4c14
font_01_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 10532 bytes
SHA-256: b5c5108ca001430b3e7c5e043275c7b72d01e28d989643242a1f04a6a8d39875
font_02_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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