Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee26ca4da30c388…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 13:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18b5346342be1688b280dd04f5635a7d SHA-1: cbdcb944652ed2cc33a8aea48b05fd05c6842de8 SHA-256: 6ee26ca4da30c3883022656ca81ff8291d5506a70a819b6e15990e8239de7460
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through redirects and numerous distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=android+miyota+9015 PDF link annotation
    • http://reklamavysocina.cz/UserFiles/File/sixifutevovunulaw.pdfIn PDF document text
    • http://mebco.ru/images/file/7969678259.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10771986524.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/46493730801.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/16103552683.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/29080354000.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/5449491690.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/70046245007.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428275cf46f---52780117663.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zubokewedogow.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/70105781005.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/8266973574.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210918_181119.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/60561857223.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/45150e7aa3e9b939730270fc649f36bb/tofilerebizabi.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/64396392311.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/katedezobinuri.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nixuvawagodobejujup.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/99403376018.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/fawowureto.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/72723837814.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/66753437652.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/rosugojumasekerurizo.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/29090870304.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_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 17836 bytes
SHA-256: b6ec023f42db38c308eea59ec2bd0093c096ba2d1e099022e2b6bfe443d37a5d
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10636 bytes
SHA-256: b41e54f037fcdb5962cd565673dd8f6c5b3919f1590291e38db91a93e0a944e2
font_02_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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