Malicious PDF — malware analysis report

Static analysis result for SHA-256 88625c83f90d1e50…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 18:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8f6665d71a4fae38f838e5d622f3949 SHA-1: 52c009d34204590f3544280d72b145f8c0150f62 SHA-256: 88625c83f90d1e50ef5aa742a1ea6ff69435d9498b68bb1c74999dfb76e53617
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, along with the presence of UTM parameters in one of the URLs, pointing towards SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://groupburuemas2.com/contents/files/52536177964.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/ligagigenoboraza.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/tagusarotarimupapisomu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e9fbe0b4---wejuzowenabakurobudewoje.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/81518437941.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/wuwugibenajejelutave.pdfIn PDF document text
    • https://ismart99.net/upload/files/96639164112.pdfIn PDF document text
    • https://serka.com/serka/upload/files/dimilisedozonov.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/vogajewu.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/30369827449.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/29390946585.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d3b139cc---pomasitusenokitel.pdfIn PDF document text
    • http://myphamasia.net/upload/files/57787744012.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/98999795442.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dovagutuguz.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/dafalonufor.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/21869850163.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dudedirabulalokimunuge.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/28074318792.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/nodedipowerowiparunu.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/49841182096.pdfIn PDF document text
    • http://babamoleskine.com/files/file/datoselilaxojuxejewosoxa.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/57009393311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=grand+theft+auto+v+apk+and+obb+downloadPDF 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_off0000b07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 14888 bytes
SHA-256: 7478798994c76551091e9c2f694eb5a2f6aed4b296373cd6547cf79698696e32
font_01_sfnt_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 10856 bytes
SHA-256: 761c122af4073ada34f8558ff8abbf92ad07502a285aa59c5c5be8ad01259028

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