Malicious PDF — malware analysis report

Static analysis result for SHA-256 08185da4e230cd9a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 08:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ba1e82013b4a43a86fd9668ed6a52e2 SHA-1: 3d9670029f0002040928371e8fc74c184e9f7493 SHA-256: 08185da4e230cd9aec7191ac673f8073acc0fa0cabb2254fd1042ba60421f42a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, indicating a high volume of links on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=android+alternative+play+store PDF link annotation
    • https://tnmkor.com/FileData/ckfinder/files/20210918_C9B1CB36BEF49E56.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/8729127566.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/zezivaruzu.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/rivapoxapefofetor.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jaximamobunon.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/46267397129.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/xedakuxog.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/ruliranavivuxi.pdfIn PDF document text
    • http://zerosquareonline.com/file/fopazikoraxatosev.pdfIn PDF document text
    • https://phunhai.net/upload/files/41658920736.pdfIn PDF document text
    • http://standardamulet.com/files/files/49031646390.pdfIn PDF document text
    • https://kildevangen.dk/files/wezadevoxabetibonodut.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/33667721734.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/99092129441.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/wanewobolisowesokugu.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/pifemitilimitogetufebe.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/desobofapilatozowewagavos.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/finobukodivaronotifad.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/88614296056.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/93002578138.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e00270c5169afd991737a51c2da1361b/98265676575.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3c96ad79b6cf34977a6f697f840fb008/zujerivaxisosim.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zuwoxolobexe.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 17488 bytes
SHA-256: 1c2413a9efe14624267e3bcb5867cf12f05831b7e3eb7866d4a67771b2502138
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 10548 bytes
SHA-256: 05bb80e8b24abfb860af68f9b2d2a2f93ebbff599481da47ed9d68c683b4ebe6