Malicious PDF — malware analysis report

Static analysis result for SHA-256 055bff989bce1aa4…

MALICIOUS

PDF

92.0 KB Created: 2021-09-15 12:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a09e937204abe94b9be9d67ef00056da SHA-1: 338ba307d94882cb389c16e7cbfb472453081d87 SHA-256: 055bff989bce1aa4a28cff6a533fa99a0a121079487c39dba20c8c9a42526a6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically pointing to a Vidmate download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chcial.ru/uplcv?utm_term=vidmate+download+free+video PDF link annotation
    • https://pachetedeturism.ro/images/files/66301502421.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nawogimubode.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/selakiwo.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/65129981282.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/kadajunifepe.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/binexedujisipukifop.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/26490599290.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/xevuzegirenafinat.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337a7ddf195---21089767935.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/zufokosudemu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d483cd21b---lerozo.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/47088177246.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/witipetunukelesolenuvavex.pdfIn PDF document text
    • http://cobmedia.hu/include/raxosepuvifesorukugate.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/28438376512.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mapenexemizali.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/maporodasivag.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/goluzuwofebe.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/kosusulezovepisux.pdfIn PDF document text
    • http://fgosvo.ru/files/files/woxujuduveborupes.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/57674259648.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902084841.pdfIn PDF document text
    • http://ceroki.com/image/files/fevolufabofako.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_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 17192 bytes
SHA-256: 59bdee00692b2b953cf8ed93fed2d173c05adc8e96cf099f7cabc463ec8f9919
font_01_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 10468 bytes
SHA-256: 6a3817dc4ca81a4f7a6f19c097750be516fe6d16fd4f2513e7ef410ec4dd82e7
font_02_sfnt_off00014a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1