Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d2f8365ed5cfd6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 11:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38dccc4ee535b24121239d3c614f16c9 SHA-1: 74035311807171656c0509562d26db6371c034da SHA-256: 85d2f8365ed5cfd6b64d2731171f75a0a508dddfd6847942922956ff43b2e14d
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 PDF files hosted on various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential attempt to manipulate search engine results or distribute malware through a large number of links on disposable hosting.

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614147c87b18c---banaxegulirezatagap.pdf In PDF document text
    • http://mousike.it/img_ins/files/bigesuroxi.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/komatideja.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/sunukitojijuz.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/ninefazomaveb.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/28351683657.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/dubezajasozufurezifal.pdfIn PDF document text
    • http://slsnn.ru/content/files/39044948968.pdfIn PDF document text
    • http://canvangdientu.com/images/file/gemesexugotapizuze.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/sawapoxanitixip.pdfIn PDF document text
    • https://diphong.com/uploads/38901463358.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/10479390660.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631357970.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wiketizatizebegokeseba.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/54849748478.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/47103019772.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/38557116706.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/69733732922.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/16789270734.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/meboze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139259c5bcef---lesapomugazadov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=barrel+id+unturnedPDF 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 10108 bytes
SHA-256: 697f0b739bcdca45b12553d76eb0cff423df997bfadf90fcb19c23a7d96b7d29
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 18104 bytes
SHA-256: 49f6b428363c6ece49d0d95233fb0b7d6a2034e29d742a6c63d5f2bd5cca7020

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