Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b69217ae1b6c6c8…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 16:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dfab683064b99156f06205dbfd6d0b1 SHA-1: dbd85ce171d8ae04f605378c19567dcebf0222f4 SHA-256: 2b69217ae1b6c6c857aebf5b2bedc73d5b90980ac1a10f7d2446dcc5a62f457c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to distinct hosts, suggesting a link farm or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d89357d7933e2b21204a198432765c95/69843852194.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/puzusolipi.pdf
    • http://sergeybazarov.ru/file/juxepetimojatupad.pdf
    • http://3sdent.com/upload/files/lokulikewitasurenupex.pdf
    • http://belgium-ex.com/images/blog/file/gidatavon.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/buguxop.pdf
    • http://bodegaadrover.com/userfiles/imagenes/4449966626.pdf
    • http://gldbirdgel.com/user_img/files/50548453997.pdf
    • https://veaodaibrahma.com/uploads/image/files/mibuwog.pdf
    • http://world-green-hope.com/uploads/files/nawujosirago.pdf
    • https://xebecdesign.com/xebec/userfiles/file/sogisafe.pdf
    • http://oroblupiscine.it/userfiles/files/riketaluxotulebeva.pdf
    • http://lehnerkom.de/images/uploaded/file/5936623003.pdf
    • http://idcla.net/upload/files/ligofoneretafumijol.pdf
    • https://promise-land.com/upload/file/tutegedelom.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/toxobevim.pdf
    • http://cukrarska-vyroba.cz/UserFiles/File/22676198328.pdf
    • http://musicpark-live.de/userfiles/file/pisorasovem.pdf
    • http://onlinecommerce.bg/uploads/pages/files/berujuda.pdf
    • http://vngo-cc.vn/cooker/public/files/palonapivazarezu.pdf
    • http://gianniarnaudo.com/userfiles/files/ninijufap.pdf
    • http://strahovka66.ru/userfiles/file/48414024495.pdf
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/sokukuxawixuxaxuxatub.pdf
    • http://salman-group.com/userfiles/file/guwavose.pdf
    • https://seger.cz/userfiles/file/15537245850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cheats+for+pokemon+mega+emerald+x+and+y
    • 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_off0000bd9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9F 16792 bytes
font_01_sfnt_off0000d5b6.bin
b6d217b0104459183bdc1ad41e18c7371806667a9822637f2136a08b461c8107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 11192 bytes
font_02_sfnt_off0000ef9c.bin
973f7c8259abd406a28eac2f6e3cbdafbff790a42ec55cd9a27db29a2844dc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 18628 bytes

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