Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb1689da50bc327…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 03:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25c4762f2a7a7bbb27e0cf2886061d1b SHA-1: 10f5beaf19329311483fe88f8214fa20013d7161 SHA-256: 8fb1689da50bc327105b5fac531595098001e1704dcdf683688521f6d1034c3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure itself is also flagged for suspicious object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=chrome+inspect+mobile+device PDF link annotation
    • http://hoinhikhoavn.com/img/files/bowirodoluretud.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/94788765684.pdfIn PDF document text
    • http://cloverdiamond.com/file/63975506521.pdfIn PDF document text
    • http://classtool.info/upload/files/81027312383.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/29321698165.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/58333701495.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/reruvigoloxasiwujuleba.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/66745345194.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109101248311482.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/laxadewidiligotuv.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/dulebajalalumelubegopu.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/98736215586.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/wakakexuwabotamovuwizim.pdfIn PDF document text
    • http://jonme.net/ckupload/files/mumujiripuporikijoxole.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/doresezoposagovufotepejo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614261ee6d768---kaxekelagijusewereti.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zokukusa.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/16193160917.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/lavulelemibuja.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6128a0acc0db84773e7b447a6954c98b/fevokodamolosawivekoti.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79640929903.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/84465147700.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/79517437794.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/41703866220.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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 19072 bytes
SHA-256: 3e5a7ef5dc0eabfe8b853263355ec60c9cd1f7a08cf3bf89716f2464ef53c7af
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 10856 bytes
SHA-256: fea6fdcab667f8c9e66f92c613476b9c5c6f3a4b1ffffbe9556fc49e216bb668

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