Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a84d53cdd92ad29…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 01:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e29a68f7f601c30707ec1a6787c7b7b2 SHA-1: 6e1069204075e2b29a3f97a9b4b588658d005a4b SHA-256: 6a84d53cdd92ad2982b82c28e8b4c09745c9f62284a16bb7a1c775867f073121
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or potentially compromised sites. The PDF structure and embedded content suggest it's designed to redirect users to these external sites, likely to facilitate phishing attacks or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=is+spinach+rich+in+vitamin+d PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/376b35297642121bdd46334416b009ba/fejuzububodagu.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/69267757086.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614009770d12b---zekowikisuxezetux.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/54705486944.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/8510334064.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/44987494393.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zubuponij.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/29058890388.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/82225670682.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/79617198865.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/bebizojekatatevelam.pdfIn PDF document text
    • http://vce34.ru/attachments/file/65929991635.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/rimajekugolojezapif.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/55177001510.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/dabugapaselosove.pdfIn PDF document text
    • http://smogy.ru/files/files/81480927487.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/naremasikavilez.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/63417395319.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bigipisovav.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/46631144198.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/73537505281.pdfIn PDF document text
    • http://xfswchem.com/upload/files/jenuxizus.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/totafitobawuwovitowipuf.pdfIn PDF document text
    • http://gskrem.ru/img/file/91123063346.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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 16052 bytes
SHA-256: 18fa40b5fdc0f2fbb7c7bc272ba9e10d205c9afb1da5a567ee37c73dd707ca64
font_01_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 10496 bytes
SHA-256: de21501a44837853433b1a566fb3a1d6598b0626193fb5a812815d12fdc7c00c
font_02_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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