Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4855a23af692f57…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 11:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c2fb9bd21fd907acd630c31e3b73b4e SHA-1: c699c430fd3e56f00c090a51bea9bdb9c71f22d7 SHA-256: d4855a23af692f57f91bfbb6b7ad81dfa6fea4a8bc8505546d33b5f1a3402e9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://balone.net/_upload/file///13001260032.pdf In PDF document text
    • http://dunajecbiala.pl/upload/File/revimoxufadeneb.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d235cc029a---vedidotulosupe.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/lajomogalerapelupavedu.pdfIn PDF document text
    • http://e-district.org/userfiles/file/bogirumatasudom.pdfIn PDF document text
    • http://bdn10.cz/files/file/wojiwawojetufevixizunuf.pdfIn PDF document text
    • https://tessuno.com/upload/files/6137dbd111cd2.pdfIn PDF document text
    • http://freewest.at/zelomozovejit.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/wenozipizigoman.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/517925746.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/pabenixulafuzonar.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/futuvutoruretafarunozega.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/xijavotulebuxez.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/62088223827.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/nigafe.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/96497534815.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304dc5e22e4---vagugotodurelovazovisaj.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613c749f4de30---63202382145.pdfIn PDF document text
    • http://builderall.info/userfiles/file/xepisamufubudozedi.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nemabixefigukalemeruti.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/15183259185.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/20164710679.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipazip.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/45403183241.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/64278221171.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/17845126165.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/57609776514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=puaada+punjabi+movie+download+filmywapPDF link annotation
    • 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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 17464 bytes
SHA-256: dbf4123022d93d40d893752234acb200084c59e6422080573e598503ea417cac
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 10928 bytes
SHA-256: da8e4566a2b2a710438315a3ef33539591b3ac4e6135b473ad2ffcd2cc1b0feb
font_02_sfnt_off00012606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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