Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac51f0fcedcafa54…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 18:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f3746ec45c874b670f1889b4669c4b1b SHA-1: d4a687081d613cb64869cf54ccbecb41912c1340 SHA-256: ac51f0fcedcafa54bfe2de1748afd0538d7c4fb914243f2de2a32210d5e4ae66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://newfrio.com/userfiles/files/91708797407.pdf In PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/femiribajelutadubizosip.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109032211502744.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38354530997.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/90813929830.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/4167270925.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/sotarutuvulikatotusodavej.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/64733617066.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/13959743289.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/17940534963.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050903319995.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/98590254280.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/60039878025.pdfIn PDF document text
    • https://trystsalonri.com/images/file/50193755773.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/wiguxemifirasuvipaz.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/zozakoguzufasubulaje.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bac950a954036d87eea944f5eb8ed72a/81637125713.pdfIn PDF document text
    • http://etnorom.hu/pictures/60909564880.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/51189057836.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f58a1ff---73448588919.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/90871112311.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/2410348430.pdfIn PDF document text
    • https://successalpha.team/upload/files/61859388567.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/45030205302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chrome+view+cookies+for+domainPDF link annotation
    • 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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 17776 bytes
SHA-256: 08f8ac5f6c293e58da7199d347f74884d84dee2df6128c918d0bf51307aebaab
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10872 bytes
SHA-256: e8fc0f97da76533a87b6b293efd803624915f5a2e4c489aa6209c0016ee13cca