Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9828ea71e9a0bf…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 00:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18482fb6e370178b312895a6bbddb0bc SHA-1: 9e6bea9010fe39cbc055a94a45830cd311dfe3be SHA-256: cf9828ea71e9a0bf6ebd5b3628e21928c11d5f263eafc9541f8a2f15b33a62b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous external URIs were found embedded within the PDF, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=the+best+blogs PDF link annotation
    • http://gryfarmerskie.pl/pliki_wyswig/files/pupodij.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/47440024420.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/gapawasara.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/muguzimipuxanolomod.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/sugokobuz.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/juwitudosa.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/towusevel.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bonezaxonuvatalewezosijap.pdfIn PDF document text
    • http://tykhchem.com/upload/files/getemurobu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/sivawatibotof.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/51768052836.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/77604522692.pdfIn PDF document text
    • http://htygroup.com/upload/files/95621417059.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050850456194.pdfIn PDF document text
    • https://izometal.net/mm/file/joxemavamapelijufijopo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/8421047852.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/sojuvavev.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/54183854594.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff58c86782---wotetepu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/gakomutonigidiw.pdfIn PDF document text
    • http://www.ezmoving.com/file/fawezizawuvoguladeb.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_off0000ac78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 16504 bytes
SHA-256: 80687a48d84a692a9c0a56e5cf6f1ddefe014161b15aa17a1f25c8d30ef108cd
font_02_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 10032 bytes
SHA-256: 327954c04427cc62b742330d13dba188c6c8942867c2f1fd7172bfc9dd9444fc

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