Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2937bfe7463d671…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 21:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98b214456b62022a99ed54d5da5d78e0 SHA-1: 9c728202c215e8626c06425e58309167efcbe39a SHA-256: c2937bfe7463d67163be0dc6403d00ff51e988cc32e9bfdf7aab7e829cf8c57c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, strongly indicating malicious intent. The ML classifier and ClamAV detection confirm this, flagging it as a phishing or trojan. The embedded JavaScript likely facilitates the download and execution of a secondary payload, while the URLs suggest a phishing lure or a link farm for distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=android+webview+form+submit PDF link annotation
    • http://chono.mn/uploads/userfiles/files/xirixilorejeve.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/70406903490.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210905190512_k7o784.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/noraxowevewifonibov.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/64300464979.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/dasuxedaxoxos.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/zomagesokukurixufesin.pdfIn PDF document text
    • http://riviera.az/userfiles/file/bavarinole.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/26413637774.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mudoruseligejelenuber.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/mateganazas.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/71581023396.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/9658241800.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc62f2b1b---sukewusewa.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/pirajevexuvi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/53d6fd976b33d305effafafce99705b1/midobivo.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/zujoperupekoze.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/52212265234.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/telanisibuzogasi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/79315462812.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/24258639568.pdfIn PDF document text
    • http://opersan.com/file/zixowevibigasope.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/41552101541.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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 18396 bytes
SHA-256: 98e55466ec2aeb25905637fe17d7523688252d932af3e721f353f574a43db3a8
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10680 bytes
SHA-256: 0889130503cdbb507960b06be5441132b798ee5d043cec66401d98d05c566fa3