Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed79661ba97c528…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 12:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c17592d1ddb10a4f0dbc06b7b108e6e8 SHA-1: 45c9ec490f7544ff46faa0882d0f88c4ba194e89 SHA-256: 2ed79661ba97c528264d0f2627058ae754dde1c88c68d78b2eafa19a68e6fa5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of extracted URLs suggest a phishing or content-scraping campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=raatchasi+tamil+full+movie PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/557454a66cf20349ba6629c37f21dca1/lupor.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/demesewafuta.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/boxufasafimuzetad.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/99337593092.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/60708817300.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/jarozizenajewakekusolu.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/37081656153.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fejozoviniwu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb4056f39---72567205026.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/rojubezixibusik.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/sapudutajoluzawafugok.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/11131406223.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/53668299033.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/70028837825.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/35692336804.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/55970013191.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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 17808 bytes
SHA-256: 53c8ab7f5f53d7db98dffb384dcdd3a9358eff1d15603412a04fab05b3b7f905
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 10608 bytes
SHA-256: 5bda3f78d1d55e5e18197812c6a4e33be9b7676dbdd9fa4a53f03fe4a1f6f20c

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