Malicious PDF — malware analysis report

Static analysis result for SHA-256 58936a38e7fce6cd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b21ce425799196fecabb984b6274a4fc SHA-1: b9938fa47f1e2e9300bf5394a8023737f2557e01 SHA-256: 58936a38e7fce6cdfd8b4253ddab74dbdf3ad571b73ffa859e7ac2a86238694d
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, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, likely for SEO manipulation or to obscure malicious activity.

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://inprovitbrasil.com/ckfinder/userfiles/files/68586717622.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416a9d3837a---69958153783.pdfIn PDF document text
    • http://polletnv.be/uploads/files/60801319469.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/55555926366.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/mopotiwawelivanu.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/runivuji.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/jazonarefagafowonaxu.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/49126125143.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/20152800181.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/57549392948.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/4900413500.pdfIn PDF document text
    • http://keramann.ru/uploads/files/6047144527.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xexasuburulogefolumoforov.pdfIn PDF document text
    • http://soles2walk.cz/data/file/tivepugexajamuliwepibofop.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/sewonebibebimovub.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/276d644449636a363c97f4b4e6938b51/26102238245.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/nisuwenavil.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/folorodesaned.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/31213520885.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901051851107997.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/seborefojetavibogukuvav.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/lexusis.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/rejigenigopape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=top+war+battle+game+mod+apk+5playPDF 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10900 bytes
SHA-256: 953d8b9e9ce0e78847ebe5958caaa0c1393b2b7828e05b5713d901766fecd680
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 16652 bytes
SHA-256: e38d4cd5709366085c5770630660f1c7c168dd40d6c382edfd92c574737d47ec

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