Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0eab139888e063…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 07:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 377405aca31b92a3b1fd8fdfd8b442cf SHA-1: c917e4b69effa63d73d75cda8985268e18acd091 SHA-256: ad0eab139888e063f781411d42f233f980c556f33cfc8313d81b50ff871be932
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of many unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nincity.de/inline/file/tanegotiwozaxovabo.pdf In PDF document text
    • http://dmkaudit.sk/101/upload/file/wonalekotamederogaratimu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/49116357821.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/sebewizemivixipado.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/tubefavawaboniseb.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xozudasotoxetapipewokuj.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vaxudasudoxeter.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/59842813879.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/42873d6fcd4ad7b3f0dbbc349e02ae75/3585296302.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94570449643.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/11394338316.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43221809833.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fulosotagutigazepomozokab.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/59696808820.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fadinuxadopit.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gezujoxel.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/62316078162.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/38294395572.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/ligesiferule.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/dokokasatapejadeveremesim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+take+multiple+pictures+on+androidPDF 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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 19240 bytes
SHA-256: cfb46d64d7d26d680b462cd525d8a1fa2dd8712c0c9511090e0c9e8fe9a20c0b
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10944 bytes
SHA-256: c6ac37a61eaa05e5f82316bf4945f439c7dc1f5e2d982fc3fa0212a3d397938a

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