Malicious PDF — malware analysis report

Static analysis result for SHA-256 26baae89006d8caa…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 11:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 232caa6b5bc1da5c21c142003dde37f0 SHA-1: ecbbbee660cd25e65697310d06a52a932297494a SHA-256: 26baae89006d8caa2abb2ca843deafb5625f6e2de760aec43820677f36f7908d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. Embedded JavaScript further supports the malicious classification, likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=pubg+lite+pc+download+android PDF link annotation
    • https://bisnismedsos.com/userfiles/file/pekabewibososavimoteza.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/tawuvakibevud.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/51445940385.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/71290458457.pdfIn PDF document text
    • http://keramann.ru/uploads/files/82406019907.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wawizutegates.pdfIn PDF document text
    • http://kd-council.com/upfile/files/17800695984.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/99051358701.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sotatuwipojepadukigasinen.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/akq319sq7meg5l0ngqorsdoqj7/dadonigok.pdfIn PDF document text
    • http://seto.cz/uploads/wofisexabibunefajipox.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/lererek.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/dedinefufirel.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/bupuzisija.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210915231403.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/70798570513.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/87569720309.pdfIn PDF document text
    • http://kite-surf.sk/files/20152491152.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c7dc3b3ac4b7081324cbc7f2aed726f4/81674937930.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/51401427171.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/xisawikeniw.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gekotireni.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/72267560291.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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 10848 bytes
SHA-256: 4ac342d06eb1f8e9713ecda1ee7d573f5b45f8b33494e71a79fbaf244e4fa395
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 17264 bytes
SHA-256: f06bae04b8077b30e01aba7d97b506fe25b89d34d4cfbb47386711848ffdda3a

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