Malicious PDF — malware analysis report

Static analysis result for SHA-256 eece7b12fc691109…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 18:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d979bb24832194ba65879d7964d8488 SHA-1: 2fd042bf7b4df3104b4a34befbf3c3192f6bd638 SHA-256: eece7b12fc6911098aad99826dcdc2f8561a7fef635a019978912746685be072
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 that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on disposable hosting, likely to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=defense+zone+hd+apk PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0ocrb5gupakrskai3u1kndesn/jukeropa.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/zagemoziwaxukidezi.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/83964045691.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///kurulovakaxojagof.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/balufib.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c078449c0---843363189.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/7904178857.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kejukiruduxirebinebabefiw.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/67198509967.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/7456827677.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/82901758984.pdfIn PDF document text
    • http://effekt-film.de/files/file/xuzigilujufi.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/sonugepivepukadezaz.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/89247784286.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/21845548397.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/29785946669.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/viwesuzajuvomujun.pdfIn PDF document text
    • https://bak.vn/upload/files/famiwifene.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///xatevapexutaz.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/35540734566.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/zogegawofokovavad.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/42225861024.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_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 10412 bytes
SHA-256: 456a36bc899f9b6225edb3ae7895f7d3d6ed34e6de00f48de7afbfe8d5fa9ef4
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 18748 bytes
SHA-256: fbc0738b2559aa8dab515df2cdc040f1e4d9b4abc0bbf6c416aeb129c8f5c822