Malicious PDF — malware analysis report

Static analysis result for SHA-256 b681922637995bcd…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 14:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 120dc532bc0a62f7cb17a91024814955 SHA-1: 2566f9d254e53709b29709fe32103b645e38c47a SHA-256: b681922637995bcdaf48cc20c6e9835132ccd779caec9d0da432e84559af4511
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, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://kamnitikamini.si/upload/files/burejovosifutireviju.pdf In PDF document text
    • https://mytopics.it/uploads/file/42409370023.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631304020.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/29406878758.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/82386409242.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70621513619.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/4907596916.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ditinaxuwararerof.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/zetamubutimipikobujujow.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31755056779.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/37726065225.pdfIn PDF document text
    • https://preciseenergygroup.com/media/52367406364.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136c48e5d995---55924721226.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/jitugomusevolofela.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/rubaxobixevulujebokogov.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/nemonanabujuw.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/60224415754.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/vagufikotovifibupagosinir.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bibav.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/25904293038.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/firamunozaxesivumobenop.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2057b4de---85963646385.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/rikefifizolopemezowu.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912185251.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/79525361197.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/daxevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mulshi+pattern+full+movie+onlinePDF 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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 10784 bytes
SHA-256: cd61fcdea84abcb87b7a37f1deb36d56fa51def54055d19db2aeba79142dfcaa
font_01_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 17008 bytes
SHA-256: 46e52394454b8864d44e67c69b4c0d93aa45fecc703f978815f9f67cf2c860f6