Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7db3913ecc0a79…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 01:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 518269c54b1f9663bd0621a3b9f6ec59 SHA-1: 2128cdaed30238e6b9773733d2055ccd7559197a SHA-256: 5f7db3913ecc0a790a4463fef773ea236e6f27b816be3e248596cc0e9aae68f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious files, and the 'SE_DOWNLOAD_BUTTON' heuristic suggests a deceptive call-to-action. The presence of a link farm with disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://buildingexpertsdirectory.com/ckfinder/userfiles/files/xuxoligutepokavakuviv.pdf In PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/60888494758.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/nojibefaranumo.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/60510194294.pdfIn PDF document text
    • http://kahasat.cz/data/file/vigematabo.pdfIn PDF document text
    • https://activepymes.com/pub/file/5729015217.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/30666627596.pdfIn PDF document text
    • http://heureka-cz.eu/files/zelute.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/dodeboxogi.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/monez.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xuvawosidotatixer.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/27623761649.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/kinapisaxabumedinabe.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/967981896.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/930eb63dd5e62123b98c5a942dd69a1b/18696154892.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/66693148086.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/24849954346.pdfIn PDF document text
    • https://dm288.com/slicice/file/gonuwopowuwilonijet.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/37215867142.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/73076726098.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614516263492a---62470037170.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/80731804968.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/xaluwit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+fallen+123moviesPDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 18448 bytes
SHA-256: fda3c0b79948edfd61379dfe7defdd51916877f3435250e2f456890a526c6f5e
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 10904 bytes
SHA-256: 0ff24d8e0da6856c59165e9d63b651f6b2fe8e37e1ed8e198ac729e1835957bf