Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca7bcbeb7cdbcc8…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 15:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb6552d29e8a4c5c1cb8152193471829 SHA-1: 2346fc2cd2fa11560a999cd20c0c8df405607fea SHA-256: cca7bcbeb7cdbcc855075ce0c8b359ca3ba303bb7c24e609466958bdfebae999
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=como+usar+um+aplicativo+android+no+pc PDF link annotation
    • http://hanifeugur.com/image/files/vamubadegotibulipoforinit.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/sexelazerazubi.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/zoniwenaje.pdfIn PDF document text
    • http://hflchw.com/upload/file/gugusijetevilokejap.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/gejowowutubuzisozad.pdfIn PDF document text
    • http://119pump.net/d/files/ditofumogepulutene.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/8609272287.pdfIn PDF document text
    • https://parfumzone.ro/files/file/tusebisosiradafopuzinibar.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/46547495206.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/rivolosedijodujabikirujo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pofakewode.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/sabupukof.pdfIn PDF document text
    • https://qkon.ca/images/file/bopisawuxobo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/79701951157.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210916_B6A5B52324121686.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4b948952---77634138275.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///5834467632.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/68633124985.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/85176646935.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/sovovim.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139148152609---67591334890.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/fadutegakegik.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/dakutubazewodusogejabipos.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/96991404851.pdfIn PDF document text
    • http://centronegozi.com/public/86101514840.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/89567866556.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10740 bytes
SHA-256: eb82fcb9926b5893a5bf6de0fe01b8e255f68e6d2d7d43c1685ffe2f9dc0054b
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 19500 bytes
SHA-256: c6cb8f38b656c8f0685458ac829aff36933bb2eede31ee3a300838f99a4a3e1b

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