Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efe8fd5f4c4486b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 13:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e632bda91ff9d5e7abc45c1872ccd476 SHA-1: e49a9c9554aed1bbe367595f08f7fa5ac65c8fdc SHA-256: 9efe8fd5f4c4486b7e96cea4ed8b9d9cad49ab7f41718dff66428524a5fa9c95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are linked to disposable hosting and appear to be part of a link farm, suggesting a phishing or scam campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links pointing to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=credit+card+bin+generator PDF link annotation
    • https://ntc-container.com/upload/files/32349812391.pdfIn PDF document text
    • http://headrepublic.pl/images/files/48132231648.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/gibesalelejatupubox.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/84451659514.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/22293636217.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3bcefb1f7e7d5766d2a713154100d066/fejexej.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/52147023096.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/92557684544.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/49722844965.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/42969754963.pdfIn PDF document text
    • https://aedwea.com/upload/foto/5935725766.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dugolovegifokokigiwokidot.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/92405026501.pdfIn PDF document text
    • http://vkts.se/userfiles/file/fuzibi.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/58489472774.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/kedupa.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/deranugutuzatakipu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/mowewuta.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/kopowu.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/puguzutew.pdfIn PDF document text
    • http://lg-palette.com/upload/files/61773266545.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/wizafiwupo.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/87636181381.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/tiboruwejim.pdfIn PDF document text
    • 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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 17032 bytes
SHA-256: 94845f8aa1386a4f19c84b31b0ebe056033d3387916cb5a3811059d778389d14
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10504 bytes
SHA-256: 76ee81d5ab34473e49100f516576aee8317fea9b367d363f9c76ff2e3c9b6f4a

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