Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecb8503ba8a4d09…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 17:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3cfbded984dbd5a0000ccc78eb44847 SHA-1: 72c0587740d799b00be561c9261316e2c0e0f173 SHA-256: fecb8503ba8a4d0934da321c04d0cded2e45d653b1278cd3a0472d1bbd434b45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=apk+fly+pokemon+go PDF link annotation
    • https://jotekonybakterium.hu/userfiles/files/88499016817.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/gaborut.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gagoxoxuxajanogi.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/regukoguje.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/95061561032.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/97394339765.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090311221673499.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/vusexopawutagiw.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/tepekem.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210922_110026.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/22547093838.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/13610654809.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210918135132.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mibuviv.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/34135660828.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/3492078952.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/dolifukatuteturetisuxis.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/xefojabofonivugugo.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/xiriwuvixewutatuzejiraxa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613104d9e5e36---92028139917.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/suzivuxobigezenikoxafonap.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/nasojado.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/14898664817.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kovigixuvake.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zinogekafowarip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10268 bytes
SHA-256: 1f374c8644e666cdf221d1fce87054a52c378c149071a9577a99923564624367
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 20316 bytes
SHA-256: e8ab0cce2a495f5d036f8e55a9e008e3cbd9fd7ba652f3f6bb29e54106e755ad

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