Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db20f7fbb599fd4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 23:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3412e48981bdf91a3913127d098e02b SHA-1: f6a4d394c6e93057436c200ae2de8d102e3371ae SHA-256: 8db20f7fbb599fd4a8c2f0559fe38d47a22fce698cfbdf6d1f28c9e02b94d8a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396a388ca34---pudaf.pdf In PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/4830657841.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/60360748219.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/97231064793.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/64987449145.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/mixuxab.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/kinosilajazutowibef.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc88d61b4---97832069892.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/94297217294.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pojomuxerefavufowuvu.pdfIn PDF document text
    • http://cbstav.cz/file/nexaveverimolos.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/29104165866.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28977342824.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kekowasunafaxojumilel.pdfIn PDF document text
    • http://hidropro.hu/upload/50355236945.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/nodowemigurirasamami.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/jirexeg.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/zimefonelopixi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/68791803963.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/86210754954.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/lavajopuzu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/62271236673.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nujeduwakivafaxunazo.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/70739005988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=windows+7+professional+sp1PDF 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_off0000be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 10572 bytes
SHA-256: a37ec2e841c7d74fa85b7aec273484faeedde6e4e18eb11eb9e99e204f713945
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16692 bytes
SHA-256: 89c0c6c8b5f46d56a4c00c514feff8251062ae00c55470eecfd13530b8bafbc3