Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f54731fbf08909…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 19:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b94340d488866b85aaa81a44a6f47a0c SHA-1: fc2133e71e5d042246e66ca018c2179605b322d5 SHA-256: 06f54731fbf0890981bda6b8a66744c305e21ba5e3dfdc042291178e51c9a144
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript may be used to obfuscate the redirection or to exploit vulnerabilities.

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://medvor.ru/uplcv?utm_term=rubik%27s+cube+android
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/wefiloju.pdf
    • http://quaint-house.com/images/blog/file/4404289184.pdf
    • http://antonio-pelella.eu/userfiles/files/96849110040.pdf
    • https://rkdestate.com/userfiles/file/60595699631.pdf
    • http://nbmounts.com/userfiles/file/1630690908.pdf
    • https://perfecthospitals.com/FCKeditor/file/48714978516.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/moketujenofimunuzapesig.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c87664a8f755fed27cfd3ca5284f1e81/zutugavenako.pdf
    • http://costruzionibulagna.it/userfiles/files/malukazapok.pdf
    • http://saxonrt.hu/img/userfiles/files/86665703760.pdf
    • http://sh-songshi.com/admin/upimg/file///pumixitas.pdf
    • http://cbafjvn.com/uploads/userfiles/file/85134153410.pdf
    • http://esrafisek.com/images_upload/files/fezubanosademojarogawesu.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902071404359629.pdf
    • http://stomerijindex.nl/images/uploads/67367615856.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/finagotajane.pdf
    • http://styrexon.cz/userfiles/file/94119514989.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161308f93a59fd---37127281867.pdf
    • https://fototipia.hu/files/files/34107470855.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-6/20210906155444781464.pdf
    • http://i-physiology.ru/upload/fewaxowafolulug.pdf
    • http://ellev.fr/upload/files/77518963305.pdf
    • https://bahispesinde.com/gnc/veri/_files/31214300883.pdf
    • https://sklepbonus.eu/userfiles/file/92368165551.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_off0000b34c.bin
6b49087193868d782de25e4dc1979e23f43f2e78b7baf63c5b7c43f2e113dac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB34C 14572 bytes
font_01_sfnt_off0000d79c.bin
6a4f8da9e5345ce5e3cec18ac558d9fa9d87ec8bbcfd5738bd7d2652bbac87a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 10632 bytes
font_02_sfnt_off0000f017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 16792 bytes

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