Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cff3871083c068a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 05:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5a9915728e8b101c9dd5466b90b963e8 SHA-1: 1adff4a199ac210c2c6627cfe128e4fba66f4708 SHA-256: 9cff3871083c068a40ab742579bcdc138741f235b84d10f757314813067b48ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to suspicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination through a large number of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://thibangoto.com/app/webroot/uploads/files/gesefabefovidenaw.pdf In PDF document text
    • http://vibrobreaker.com/files/files/kaliv.pdfIn PDF document text
    • http://gewald.ru/content/Files/55002129.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/22561012908.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/70s1l7q0eg66hg8t5m6bhurejk/digele.pdfIn PDF document text
    • http://gibisch.biz/files/files/tesadureririxovotunoviru.pdfIn PDF document text
    • https://mahae.hu/files/files/xovetajetutipilexajiweri.pdfIn PDF document text
    • http://mosjob.ru/images/file/55323465846.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/nalijonumojusekowumavi.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pajasagoximada.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/24619763332.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/sokafozitug.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/sazejufelerori.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/70372711753.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/6170094336.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/52934355989.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/79666638884.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/24326855002.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/latuxo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f243144c4---9611280920.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4453289550.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22807670458.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/jarobuw.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/losanened.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/ruzekavi.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/towimotebixixetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mod+grid+autosportPDF 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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 10376 bytes
SHA-256: 59c23ea0bf8eeee5614aa086e32545c14dd5a7ecb2da6152963d070337b4cc7d
font_01_sfnt_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 15652 bytes
SHA-256: 0ab9a6cf84dd1103e59f79fb8ef4939c936812e7f9357615a3fc93a870cbd8b0