Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15b050bfcd6c74e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 16:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf0af660a3c1ad91f2cac33e103a4577 SHA-1: d7abf3ae1001807e389f7c189839641691c035c6 SHA-256: c15b050bfcd6c74e53dc277e66e1fb26d0b812f9db0979e09e4a9139108efd12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, including one pointing to 'infrive.ru', suggesting it is used to redirect users to potentially malicious websites. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=wechsel+von+iphone+auf+android
    • https://medosojewellery.com/userfiles/files/visileja.pdf
    • http://texinpack.com/uploadfile/file///2021091713195527.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/vobilugipubegegawexo.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/31jonc6ig0hs0r78atrd9704jb/55515148097.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/50658090490.pdf
    • http://giadinhlaurenso.org/upload/files/sewewemajobagejor.pdf
    • http://snieznik.pl/userfiles/file/43293229706.pdf
    • http://classiccar-jp.com/js/upload/files/6548711303.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/rusegijasisirigepeluj.pdf
    • https://maintogelonline.bet/contents/files/91791632257.pdf
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/xerivurivaxet.pdf
    • http://hb1004.com/userData/board/file/61612677783.pdf
    • https://digicpictures.com/downloads/dobadubuteziworiz.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c2644d81---33183028819.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/wuxujas.pdf
    • http://polyacer-ecp.com/userfiles/files/20210902_010600.pdf
    • http://ryukatsu.com/userData/board/file/sidezawijabotibogogux.pdf
    • http://ballmillfactory.com/d/files/17305908390.pdf
    • http://art-ball.net/files/file/29484412137.pdf
    • http://fundacjahfg.pl/upload/file/17176049103.pdf
    • http://pitin-akutsu.com/js/upload/files/36012381227.pdf
    • http://digitalpolicycouncil.com/imagenes/file/redimogubopejabo.pdf
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/mafaladipizasidurav.pdf
    • http://ceramkgres.ru/userfiles/file/27653091286.pdf
    • http://www.armstrongre.com/files/files/28192510153.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_off0000d5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16792 bytes
font_01_sfnt_off0000ee09.bin
4898755ccfb22aeb936807f40ae2f91e974aeb8c89950b1b4954e5ca8b33cdae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 10780 bytes
font_02_sfnt_off000106c8.bin
19456c717675f0e44ba67ad833d670bc670f9f5b6768e609b9de6ca6857b1b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 19896 bytes

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