Malicious PDF — malware analysis report

Static analysis result for SHA-256 968412bea6cd87b5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 20:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b50da82c60434c5a34ac4bbc3d4ec1f3 SHA-1: 27bc8d2fee5233fabfad42acdf117b852374ac15 SHA-256: 968412bea6cd87b54963297c284d28f0c9d488a332b49a5ef90b6fcf397b587b
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 a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=gboard+stickers+not+working PDF link annotation
    • https://s-serviss.lv/userfiles/file/64547910425.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/tumexusudatozikatokusez.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/83654215035.pdfIn PDF document text
    • https://tigaintan.com/contents/files/35428103545.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/bilol.pdfIn PDF document text
    • https://italvaping.com/file/kulamalejo.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/rojudilike.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/53957897167.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/juresogaraf.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137cffc87ae7---93978695981.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/88626214017.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/53679829499.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7d1a61afc---vosovu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/rigakoxatixesalefirudak.pdfIn PDF document text
    • http://torgoborud.org/images/file/73860422361.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/wubobetomafexoripofusewar.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xuwudipuvevidogez.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pizaxopirivilefawepima.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/63924221869.pdfIn PDF document text
    • http://cartopack.be/Images/file/50451169490.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_06A04D55F7B37768.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/43540786812.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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 10856 bytes
SHA-256: f2daae05c44efff79825cd8dde72c5fe42fa02d104319c3f7b8eea6e69484d83
font_02_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 18440 bytes
SHA-256: 7077b5c720f0f73b4d574a08ecf2772ff259ccd75a57d2961b937aa32a086854

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