Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a794a0f485b2bd0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 13:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35575a8916fa37aef2f7556946ecf12 SHA-1: ebf5fba017ad789ec030495892e32a0d941aa6b5 SHA-256: 9a794a0f485b2bd0c72a381dd2123aea29e59345ed599e835743248045ea40c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to external URLs, such as the one found in the PDF_URI heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=pokemon+go+joystick+2020
    • http://bayanairag.com/uploads/userfiles/files/95886896383.pdf
    • http://churchtextile.com/userfiles/file/gowuwotubadixinuzufi.pdf
    • http://usateatop.com/_upload/files/64200083479.pdf
    • http://kientrucnhacuagio.com/upload/files/92651506530.pdf
    • http://ducthanggroup.com/webroot/img/files/42026572908.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/vimatu.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/vasugu.pdf
    • https://ximangcampha.vn/upload/files/16932840900.pdf
    • http://steinemann-ag.ru/40679304235.pdf
    • http://simonide.org/userfiles/file/xejevapufibowuxogejine.pdf
    • https://equalland.com/uploads/File/95861163343.pdf
    • http://thermcom.cz/userfiles/file/90105765373.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/vogideje.pdf
    • http://chafewyuok.handysociality.com/upload/files/98206393919.pdf
    • https://stephankeppel.com/userfiles/file/31168061551.pdf
    • https://panificioilcavaliere.it/userfiles/files/navazusapodifeperuzibit.pdf
    • http://sgrappresentanze.eu/userfiles/files/95722788445.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/kegoxiseramadoxifo.pdf
    • http://icltindia.in/userfiles/file/kuwiwodofezosimividawaf.pdf
    • http://pitin-akutsu.com/js/upload/files/97780501897.pdf
    • http://sanzmendia.com/userfiles/files/pasefalokamodevevajefarel.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/wuzinobusuwopuwizefojike.pdf
    • http://volkshilfe-ktn.at/images/content/files/nanorijepojifusevozatoji.pdf
    • http://lynxauto.ru/userfiles/file/xogideduvasupebe.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_off0000b58b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 16792 bytes
font_01_sfnt_off0000cd9d.bin
24e29dee645e7a10b37db0b8b6b4e5da90a4272716422ed93fe90b9d9dece0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 15404 bytes
font_02_sfnt_off0000f4bb.bin
ba988981cec6b0c83e3043712c940f0a934d05370496d11b5fe40b9fef988da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 10844 bytes

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