Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7e98e301ca0143…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 01:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39bbd90abf83b2eac3cc146e78d57d50 SHA-1: d30d7bb3bbe5cffe5b3482fcc0a34f35d7f7aa7b SHA-256: 1c7e98e301ca014305e68a561ab8e85aaed57f491a837ac718bfa18d6bdfee20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=android+ui+layout
    • http://audidalys.lt/ckfinder/userfiles/files/zimifisajotusumubepozil.pdf
    • http://apexibd.com/uploads/fck_uploads/file/kosijovubimexaduzunedur.pdf
    • http://kiajihlava.cz/UserFiles/File/5758169879.pdf
    • http://osteriadelcampanile.com/userfiles/files/10439145136.pdf
    • http://capitaldanceacademy.com/userfiles/files/munefa.pdf
    • https://rzfmuhasebe.com/userfiles/file/fufazegufuzekabema.pdf
    • http://izeninfo.net/admin/upload/files/3194769021.pdf
    • https://sitarasign.ir/data/file/6275142989.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8f02be39---livewotuwaxuwitifigivetuv.pdf
    • https://decoveinvestment.com/userfiles/file/27520968154.pdf
    • http://ch-bovi.com/upload/files/4058421753.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/51372e434a721dc5f155e43c4b492465/63407148280.pdf
    • http://kmbb.at/userfiles/file/10136453333.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/vizibamaruzujedonukawedid.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/32798995151.pdf
    • https://bahispesinde.com/gnc/veri/_files/83019718317.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/19403370643.pdf
    • http://holdemigny.fr/ckfinder/userfiles/files/69106989821.pdf
    • https://mavachhaiphong.com/upload/files/31835154296.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/3873046248.pdf
    • http://mebelhotel.ru/images/news/file/woziwefuxidugelasos.pdf
    • http://stroisvias.ru/userfiles/file/mekasodabe.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF1 16792 bytes
font_01_sfnt_off0000d303.bin
9705869dfbe597954e8bcbff1f70717c16c2b23051543595790f976349699cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 15348 bytes
font_02_sfnt_off0000fa21.bin
544df5903c355a05935ac5f4dd668943673854998d10368e2d03e1bca75f154d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10136 bytes

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