Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7f52ca3d4c1e6d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 10:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d0a741f5b5d887ff4a107f1cbfdb8af SHA-1: 37832b6c27dc3f56d33d42494d377f1ac4db13f6 SHA-256: bd7f52ca3d4c1e6d559db6be5690813a54f529bd0b7597a72affed3194ffbf55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as download links for PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to distribute content or malware. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=minecraft+pocket+edition+apk+full PDF link annotation
    • https://sabagdasarov.ru/upload/file/7418216957.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/tikato.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/93914885225.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/82131809358.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/36870236193.pdfIn PDF document text
    • http://rts-3.ru/upload/files/91963537353.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/14905197865.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/70556758899.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/rozen.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/71171759806.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/4186492863.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tajusatanutujunoruvipifan.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/taramogaraxoj.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210908103656.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b4dmdsh3fs50rehi84sbb7cnkb/70737427960.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/33825641767.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/21559797499.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/wetebogarozidovefubu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/86248513233.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/sedariwobur.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/73920316814.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/54c6dade004d6e5cc6353ee1699a5444/juzoka.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/25479990899.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/megedanibozifuv.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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 10628 bytes
SHA-256: 1172d939e6d37422a7fec8bf1f301a3e6d545327f08971ab843b8dc87a70603f
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 19720 bytes
SHA-256: e71304d1a599f6b3cfeb52f04a783bc6129a37e8df6b549ec26bcc277ed1bc1b
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1