Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfc864ae2273eff…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 23:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c35e8ebb6b93a827108683de35e404f SHA-1: 9146fe116bebf6c9c8da8c842654d2d67781adbe SHA-256: 4dfc864ae2273eff97f12fe83ca81f7f3378f714d1247902bd6155f317424dd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=how+to+record+game+sound+on+android
    • https://ibliberia.com/ckfinder/userfiles/files/wesulesirawik.pdf
    • http://tonioloclaudio.it/userfiles/files/86679350004.pdf
    • https://asesoriagade.com/app/webroot/files/files/nopip.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/68321325614.pdf
    • http://kaies.cn/upfiles/file/xureluwug.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/47741482363.pdf
    • https://solidpractise.com/files/userfiles/file/rorekiburariwunajukuluga.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/17971206307.pdf
    • http://csc-028.com/userfiles/file/20210917005234_yxf56l.pdf
    • http://augustaelectricalwork.com/editorData/file/kujere.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/66849582063.pdf
    • https://arabadvertise.com/userfiles/files/93301040044.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/87937536600.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/62951334424.pdf
    • http://haohanlegend.com/Uploadfiles/files/koleredagixudogutoma.pdf
    • https://espiber.cl/images/uploadedimages/file/jilinotosolikedi.pdf
    • https://faktxeber.ru/resimler/files/38862235470.pdf
    • https://sapporomn.com/userfiles/files/14999529305.pdf
    • https://lee-trading.tw/archive/upload/files/nimufadunufoxegilutewuw.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d842b274d---numezizuf.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/nulobelalonemamo.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/wudufisufizomejazenewit.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e7dafec7---23993973440.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/85909998158.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_off0000e90c.bin
8db4a1221ace44c3434004d8851dfc98127f1e954daf24f5656f9812c7c2630a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 10844 bytes
font_01_sfnt_off000101e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 16792 bytes
font_02_sfnt_off000119f7.bin
acbd5e5cb14e7b0e03fc0a8464575671a846080630f006b5e8fb6384e142a8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 17504 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.