Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94af34cb7fe394b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 22:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6610feb09d4aad4f9ed1dacfe8a124c5 SHA-1: 515a7bb487c0d8acdae44d8417a842dbca1ac452 SHA-256: a94af34cb7fe394b26f5f329f01a82c91d79fb8cb12f86030dc74a7e816fefa2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kondicionery-bronnitsy.ru/upload_picture/file/lubalinulus.pdf
    • https://chief-moving.com/editor_upload/file/vivekatesetulufeb.pdf
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/30807556713.pdf
    • https://alpinashop.bg/files/42585358056.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/vapufotadunuwame.pdf
    • https://malashealthcare.com/userfiles/files/tadumokobofesatogibej.pdf
    • http://artikos.pl/userfiles/file/46514389067.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/tufovusalomibegijafa.pdf
    • https://ekinyalitim.com/depo/sayfaresim/file/nesesakuxa.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/24678535562.pdf
    • http://abwcockeysville.com/uploads/files/19344480176.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/toripugabemosujok.pdf
    • http://savalis.ru/userfiles/file/29503429892.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gamikesabuxipo.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/mowikobuzexewuw.pdf
    • http://ipost.mn/ckfinder/userfiles/files/48557576484.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/jumofal.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3c8d43b6---50048432074.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/zuvilutulofu.pdf
    • https://airxps.com/userfiles/files/92040793798.pdf
    • http://hflchw.com/upload/file/5786101587.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/7245059779.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/47424395027.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mortal+kombat+trilogy+android+apk+free+download
    • 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_off0000b0df.bin
f8b0057490532ff0c96d11cd7541c42d41a979bc6d2eec759d2b5ce3bd440a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 11100 bytes
font_01_sfnt_off0000ca62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 16792 bytes
font_02_sfnt_off0000e274.bin
19c69f2dc062bc237ed2e20e777eca66659ee4ee732c691abc51fee9e7370b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 14812 bytes

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