Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa7c9c406c41058…

MALICIOUS

PDF

90.5 KB Created: 2021-09-08 14:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b9c6b6539efbe6d345dd07926776ec3 SHA-1: 15211b004e4092f6f11c4df451692c462c9c700a SHA-256: 8fa7c9c406c41058deb19053d7fce9fa123f9025947e7f58f4b858aceb25019c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or exploit vulnerabilities. The presence of numerous external URIs pointing to a link farm on disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://servis-hradec.cz/files/file/nuvofod.pdf
    • https://dakhoathienhoa.net/images/files/99978282213.pdf
    • http://greenflameenergy.com/userfiles/file/dejutilijufizajuvozod.pdf
    • http://elite-nails.pl/Upload/file/jarilaguvemomavilomobo.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/rolexizufa.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/jeloreketimore.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/98611529895.pdf
    • http://drironcat.com/images/file/kelotizugareluno.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/25545508559.pdf
    • http://alltechsro.cz/files/76901110127.pdf
    • https://alajuusa.ee/media/contents/file/34953799219.pdf
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/32891097246.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wimuli.pdf
    • http://ozhelalikram.de/resimler/files/98311381205.pdf
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/19991567745.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/80308810669.pdf
    • https://alzubidi.com/userfiles/files/nutumewunudaxizukisupa.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/kebizazexerasesi.pdf
    • https://sharjahcements.com/images/bulk_images/files/nijewiza.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/muroronutijemexabesu.pdf
    • https://typeone.com.my/ckfinder/userfiles/files/ranevovejinavowuxufe.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/nolob.pdf
    • http://studiotecnicopinto.it/userfiles/files/37577121697.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/41c84e69276061ed321ad42ce281fea7/kirefuluvuzojo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=catabolismo+proteico+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafb.bin
cce0ba62ac5a0411bc9179456b6b681229b0bb3ac0b6d96df8206fea8bb0e81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 18620 bytes
font_01_sfnt_off00012bfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
font_02_sfnt_off00014415.bin
c477b4b39982bc6b4dece88a329df55320db9dbef864322134db643cd3eb1e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 10848 bytes

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