Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d8b63bae39245f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9549f058789ee1b635ddfa2bac697e4 SHA-1: 8a38d6e8e2b2f197436de4136fc5f8a7f4792442 SHA-256: 76d8b63bae39245f0d1d670299eba433bf4a3659876a3ac7562fc2679e1442ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable domains, which is characteristic of phishing or link farm abuse. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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 http://saaretravel.ee/images/file/getativesilefofu.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nejuzowetepapodagelarav.pdf
    • http://duet-czluchow.pl/userfiles/file/zuzum.pdf
    • http://packagingandfoodmachinary.com/userfiles/file/12119587133.pdf
    • https://berettyotv.hu/userfiles/files/fejapazumoguzireda.pdf
    • http://gocoachfox.com/userfiles/file/zoxawuposegatolefosipupi.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/remuleza.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d04ae09e---ridixu.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/78365880383.pdf
    • http://cuoredicane.it/userfiles/files/47864336973.pdf
    • http://gorsilawfirm.com/userfiles/file/kotadeb.pdf
    • http://bong-dem-long.org/upload/editor/files/fidonuwujefigafiz.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0380d839116b32e6349168b4d25dcc99/98444299324.pdf
    • http://jamesandsons.ca/userfiles/file/69942574860.pdf
    • http://www.oomewatersport.nl/upload/files/91141421902.pdf
    • https://artlabjo.com/userfiles/file/guvokas.pdf
    • https://ymvii.com/admin/upload/files/64309171682.pdf
    • http://vers-ma.de/userfiles/file/gumokuru.pdf
    • https://airin.lv/images/userfiles/file/lapoku.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/34198792172.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210907054714.pdf
    • https://firesystem.ro/imagini_ws/33228662370.pdf
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdf
    • http://esangsok.com/upfile/files/bolifimefok.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/62502569511.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/71701980801.pdf
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/32203466883.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tyson+jones+fight+live+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be39.bin
eca6040491b5d2f61524993fb1564ad103c40cc1e0e749f8e219b63bef9fb388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE39 10604 bytes
font_01_sfnt_off0000d665.bin
bb73b9a55520171bf742e2fa24d64facb9086e22e8ef4d627f9dd6e323bee45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 17968 bytes
font_02_sfnt_off0001045c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 16792 bytes

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