Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f4d0120813caa6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 05:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8322826778ab266ce567e2685cff91c0 SHA-1: 11974d545212d035b41aa6c3fde9d6575f171c52 SHA-256: d7f4d0120813caa6c47c3242378a3f00b1e0515a6a2d1c5126e865da39021b79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the phishing and malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=download+android+tv+x86+iso PDF link annotation
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/jetojuronigizimisuforuso.pdfIn PDF document text
    • https://lapakunited.com/contents/files/11182722611.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/37357398240.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109151535414379.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/95094836858.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/roridefigosifixo.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/kewazivagonad.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/junomupaka.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/19757829129.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/70312370190.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd9610d27---572803290.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/kapuvuvavobasak.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/feravax.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/4206930647.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mubirimesifu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fitipopix.pdfIn PDF document text
    • http://nincity.de/inline/file/97706987683.pdfIn PDF document text
    • http://bndweb.nl/upload/files/lopimogimu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/divarukujir.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xiponugusidejod.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/woferewajewi.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/20940623186.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132da8be35fe---11620845619.pdfIn PDF document text
    • http://sial.pl/galeria/file/jiwazozanizigivufibila.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903175935_633770513.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_off0000b1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 17896 bytes
SHA-256: 704375f75918b5e02392def56e61b1c1fb73fdada23016b6ed6fedc2cbba761a
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10740 bytes
SHA-256: 9b8fc48d57ee63b40cc1ec361767001b3a4bad13964f86f1d691e38ff1177b5a