Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5fefeb2954772e…

MALICIOUS

PDF

90.9 KB Created: 2021-09-12 07:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a8ef93a68086bb3e545912463e5d5b1 SHA-1: 147bd2868a0b3a1a28c39efab92fcd83aae69f09 SHA-256: aa5fefeb2954772e1005d2330361ac05fd9a47edc88d59367ce7bb9fc3fd5cb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDF documents. This script likely redirects the user to one of the numerous external URLs found in the document, such as 'https://coretry.ru/uplcv?utm_term=minecraft+multiplayer+on+android', which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://coretry.ru/uplcv?utm_term=minecraft+multiplayer+on+android
    • http://theartofdesign.nl/ckfinder/userfiles/files/vazipobag.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tisolefodafugujidubomika.pdf
    • https://easypayindia.in/userfiles/file/5212481497.pdf
    • https://bagstyle.uz/images/file/mutuderezejo.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/36113911065.pdf
    • https://nileagriculturalindustries.com/file/81640692303.pdf
    • https://netwindowvn.com/uploads/userfiles/file/defelu.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/bokikowidawal.pdf
    • http://allineers.morefriendship.com/upload/files/benaduzex.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/ruxasuf.pdf
    • http://luligang.com/ckfinder/userfiles/files/jomometapapul.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcc9d8c4d---48571309268.pdf
    • http://productinfo.in/konadnew/userfiles/file/wemifagatudazug.pdf
    • http://cheniou.handysociality.com/upload/files/sisapetixoj.pdf
    • https://rusepress.com/uploads/wysiwyg/files/dutolokimasedes.pdf
    • http://3xlove.com/uploadfile/file/fobijaloja.pdf
    • http://globalfeedindustry.com/upload/files/14303358564.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/5076042108.pdf
    • http://123dvere.sk/files/file/rijomazakawobekufur.pdf
    • http://karthikeyanjayaram.in/userfiles/file/4365641931.pdf
    • http://ihanzao.com/userfiles/file/20210904215634_1610583629.pdf
    • http://cjatkinson.com/userimages/nujetitesaxirariripafefip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16792 bytes
font_01_sfnt_off0000fb73.bin
21cb8af368f2e81342dc006cdfff7d5e8342e4e8cb7eec8e7829bc936fce0a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10820 bytes
font_02_sfnt_off00011463.bin
d56022cd57a680110301f50673fbc8942a73e6c7b867472d8b6dc2b235932ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 18720 bytes
font_03_sfnt_off000131e1.bin
3c66e32ac88c45b799bee6ba8a8ebc43f75cd13308955ca1caaf60218b988c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 17004 bytes

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