Malicious PDF — malware analysis report

Static analysis result for SHA-256 4867424a23c3c7ef…

MALICIOUS

PDF

76.3 KB Created: 2021-03-08 15:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8c070cd860e54fbc107958e5eeb208f8 SHA-1: e2534ba72f4d4ef1b78a4b05e0f473bd4f201b70 SHA-256: 4867424a23c3c7ef63cde7c63cbb21b460adfbb9b725d9e605d3531f27921f1d
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains text related to 'risk assessment pdf example' and 'wkhtmltopdf', indicating a deceptive pretext for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=risk+assessment+pdf+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496582/normal_603aa74825a99.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/b1ygegh/93959028787.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/V8Xgjig/gemelozox.pdfIn PDF document text
    • http://cloudplay.xyz/gusemedimexofoniwubilat1sob.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/82490302696x6qrc.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gi9Vwji/forex_day_trading_strategies_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ghig3jf/cat_bird_game.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/what_are_the_main_traditions_of_christianity.pdfIn PDF document text
    • http://new-leggins.site/96316722613wwh1q.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/45435780574.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/jd7b9gd/spinning_a_fidget_spinner_for_24_hours_straight.pdfIn PDF document text
    • http://afracheat9.xyz/minecraft_gta_5_map_apkyqngs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_603b075c1920f.pdfIn PDF document text
    • http://liko-sneakers.com/15532912412rm9n5.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/78276184382.pdfIn PDF document text
    • http://topstudy.fun/vapegupunizexewawi5l7np.pdfIn PDF document text
    • http://esagafow.fun/42131675747t0l7g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxiruzeremifam.rf.gd/nejeburemepizebesukejasi.pdfIn PDF document text
    • http://dabixuri.rf.gd/mississippi_driving_license_age_by_state.pdfIn PDF document text
    • http://fudewisukot.rf.gd/61734991118.pdfIn PDF document text
    • http://fawituwiluke.epizy.com/cadre_photo_pas_cher_grand_format.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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5228 bytes
SHA-256: 6c93d225e0c8df758921e10c8d86e68ca7b8650a4249d03f8386af0f15e18c22
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10104 bytes
SHA-256: fa029e40ba1962963f7268f48f3f8c7c4cb3e9345030b78a96d749d513b58116

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