Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d6b0c89314258…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 12:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f65c5789ed428089cc72a5e0a567df7a SHA-1: 538b912c5f069689ff4d86f28d5a7cf1b7ddf5b4 SHA-256: b25d6b0c89314258b0d165ec7b3b2d1378efdbb09dbac05d9806d3fdc8254d73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this document is part of a malicious campaign to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://newsru.md/upload/userfiles/files/69561041501.pdf In PDF document text
    • http://labuchedeberce.fr/userfiles/file/66236368676.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/74156624705.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615158bd5079b---45640204341.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/tewegirokaj.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30200515982.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/futufupezixizizevutaganim.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/buvunipu.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/19679094519.pdfIn PDF document text
    • http://mobiliteit.nu/files/gixipurimutikekudanafuz.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/suwuzezatapugat.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/15640907267.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/46443730697.pdfIn PDF document text
    • http://billsky.ee/files/file/kogolitafabowonagevedo.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/1957900228.pdfIn PDF document text
    • http://dongphat.net/upload/files/3635074285.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/wavube.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/ketet.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/satuv.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/42346107029.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lazunokegedeguwosojesuxiw.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6674ccufgk0anffps08fb3ro15/namam.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/nedisuzexopabogale.pdfIn PDF document text
    • http://futboltotal.net/images/files/12176321801.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/54819451100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+nuzlocke+game+onlinePDF link annotation
    • 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_off0000b2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 10460 bytes
SHA-256: a1863b0b4b765c6a4b34b37f2e3e686105af269362c14a0c45ba315150bf5ba4
font_02_sfnt_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 14972 bytes
SHA-256: 7e1adfbb567979e53a1cd2cedf4b1a49b0bab17c9a31bafb4f932344ea70a981