Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6583f1b18144eed…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 17:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fce8363a6e91998cfad4af61f7fa7f49 SHA-1: df37054a2eff042f1722d6f3e4d6fbd248ca8747 SHA-256: a6583f1b18144eed666a22771c4eff42c8e85ae165edd6a3e017d873f5c4478a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm to distribute phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with many distinct hosts and UTM parameters used in the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6346

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=grimsby+streaming+vf PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0f160015b29c5751136f863ec9a6a9d5/2920340853.pdfIn PDF document text
    • http://katachizu.com/img/news/files/31190352964.pdfIn PDF document text
    • http://congtyvima.com/images/Download/poposegugexixiwewisofijiv.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/91746849230.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210911205404.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/63782065996.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zigarosawalet.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/73914378234.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/61253746656.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/kovuledepiwubagawo.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/58244347727.pdfIn PDF document text
    • https://ka-base.no/images_students/files/75000440012.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/87614658507.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/64496776122.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/dinimezi.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/73634665732.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/21816240629.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jurizefibuzesaw.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/38594261453.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/16278496939.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350af09a9bd---47937259422.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/14250595253.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109180019524497.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/82638706341.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/28015572540.pdfIn 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_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 10752 bytes
SHA-256: f19ad1a1274d8659cb872c1c82c0d41bfda6f96fcd58f98b9c2abaa9c112af5c
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 17792 bytes
SHA-256: f502b6e8a3526fa66eb729611993908c3a025753618e69561250a82551f6cc54

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