Malicious PDF — malware analysis report

Static analysis result for SHA-256 9559299edf51bfe6…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 18:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d63fd75cb4dce2038cc7cac8c71a8023 SHA-1: 6ba9ba01df7ae3c17e604f635fd2c2eeebbe9922 SHA-256: 9559299edf51bfe6e677fec1d1b427fa93267e4dd7f2a22d52ff812e6412526f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=rerun+setup+wizard+android
    • http://aeronautike.com/userfiles/file/rotilawudanaguxabutijera.pdf
    • http://lollanaclinic.com/image/upload/File/dunupebebibiten.pdf
    • http://jump360.co/upload/files/20210918112406.pdf
    • https://jkmart.net/FCKFiles/File/10243008655.pdf
    • http://abwingsbuffalo.com/uploads/files/zapete.pdf
    • http://ipublicity.cz/data/file/2608421492.pdf
    • http://smolninskayahotel.com/userfiles/file/96202577107.pdf
    • http://studiofranzoni.eu/userfiles/files/dotakaberexize.pdf
    • http://magischtheater.nl/userfiles/file/rodutixogaxosuzarojabuk.pdf
    • http://fnathservices.com/upload/file/midunumosufalog.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210913035229.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lqgiddhr239pitia5teieuef4/rabuxovebimajek.pdf
    • https://ghnservizi.com/file/4159571243.pdf
    • http://3q1p.com/upload/file/210910184311039127cg0zx5c3c05i.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b12eb7eb3f---ranovimax.pdf
    • https://jetaime-shop.com/files/vazuxivetifikuto.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/42319622874.pdf
    • http://aeronautike.com/userfiles/file/74376071985.pdf
    • https://actsonics.com/uploads/files/202109082029157064.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/3267865738.pdf
    • https://migger.dk/userimages/file/mafamaxalisaw.pdf
    • http://dailymaytrogiang.com/userfiles/files/17327868645.pdf
    • http://cbstav.cz/file/rupejadip.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/25628412815.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/30537835280.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_off0000b2ae.bin
25c329ead5af920b8db2e75280ac82ad5134a2790302d1e9a4d64f58a5c29214		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 10632 bytes
font_01_sfnt_off0000cb3a.bin
9463568f9c349da0dbc6b4018e91ec152bed8e36194a7cb3468112c5a363dfda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 15292 bytes
font_02_sfnt_off0000f1e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes

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