Malicious PDF — malware analysis report

Static analysis result for SHA-256 86785ae5ecdfcb71…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 21:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbbd2911869a0727c303aad4d72b2f3f SHA-1: 41b6d86018a21e76fd97c086431be84ab9f8249f SHA-256: 86785ae5ecdfcb71675ad40fec6edc4d8ccb52f4c4ab639ea6a89a52e536e96f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent, likely serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=any+pdf+password+remover PDF link annotation
    • http://blackivy.pl/userfiles/file/fijatitije.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/nebodojeluzexevagoropojob.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/jobukep.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xogomarasatuvijeriso.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/suxasarupaxogetuzekab.pdfIn PDF document text
    • http://beijingteye.com/upload/files/35600320974.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/nevatofugaketajija.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/45629523793.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/67310167192.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1g9pecdi354jit3arei95n27q4/bafomiwimebifol.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/55628584227.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/fejadidugumarakejaraw.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/xokigusomemexijipuzudiza.pdfIn PDF document text
    • https://arendic.cl/files/96639249104.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/17197202770.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/vokigotimumisujanilasexap.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dit5vmsipsbf8i9c24n3uiqe1e/simakofoxedinuferijawijo.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/55720810454.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/95667764258.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/bapamenuvokigew.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_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 17792 bytes
SHA-256: 52e68d15d298e59f67720f787f9f4a339b51cb48b0af6aff552f0ff6c71ce856
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 10672 bytes
SHA-256: f891caebca6cc1e203c29ae82aa687f5d4f8139727e3ddc600e57193dc0b99cb

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