Malicious PDF — malware analysis report

Static analysis result for SHA-256 95011058b4a78a23…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 00:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccb0cb75838d51ba28ea74e7332f86ac SHA-1: 0c61f52bc88034d4d851339e479d61cdb34b73a6 SHA-256: 95011058b4a78a234c57be23561d4fec98a54f5c968126a7dcb7fbdf169a8670
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=why+use+android+over+ios PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903215630.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210910_E4A87540291466E8.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/xijulovogixuseb.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/kezalikatefutim.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/65995924128.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/13484796337.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vutoxos.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/20140290856.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/15312336300.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/kesux.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/kevadujefosoxoluvo.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_234900.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090315465192.pdfIn PDF document text
    • http://marketingnews.fr/images/file/3688405405.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/41129838198.pdfIn PDF document text
    • https://kiptep.ru/file/81706533556.pdfIn PDF document text
    • http://agro-partner.com/Image/files/59039743872.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/petugepijovurumefirisuro.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/29084855950.pdfIn PDF document text
    • https://www.confirmedtour.com/files/xusuz.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/70016218595.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/xikesamuguti.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7909c2769---nizapemopovadoli.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 17596 bytes
SHA-256: 47bd171a8742ff9db45cce47713b7b3b64b689ed06c7548943d6856fd7fba829
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10472 bytes
SHA-256: 654f32a34bb975027be8ef53fa2d24cb632bfa2e562f95a870cb7da0d68a5412
font_02_sfnt_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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