Malicious PDF — malware analysis report

Static analysis result for SHA-256 9933f8c10efbea5c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 00:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9197ccd2ea5b5b79285b3f2e8d5774c SHA-1: 296f0f9fa1356cfe3313a0d5eb434d7772c56ecb SHA-256: 9933f8c10efbea5cec521eb3e29c00f25d1b4753a24a4a7bb50e53329e2f15a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing sites or malware downloads. Although no scripts were explicitly extracted, the nature of the PDF and the presence of many external URIs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tucsokszekszard.hu/images/news/file/tamuxosir.pdf In PDF document text
    • http://ippinnudon.com/uploads/files/59704777887.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/364c359674dcc25f19e9293478f16ae5/wekedozaz.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109062106024906.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/dutapis.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/9539150502.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/81368083490.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/42537940031.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/jozevujoxekipubedivuta.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/wefak.pdfIn PDF document text
    • http://balone.net/_upload/file///besaputefukalixefikitejo.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/lebiralun.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/96770691607.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/381436841.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/33222247712.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/kefaj.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/18851728001.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/36972557580.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/69753011843.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/jekuvumutuzalujefej.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ce905329b---7604889957.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/6004659699.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109151229057194.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/pavenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bttv+ffz+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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 18628 bytes
SHA-256: 92ee10f70a8fa77770b559a08135f110e463a0e1cbee0a19fcf38817605d9816
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 10180 bytes
SHA-256: d2b28cfb17eadfcd8755f18b754276932d89fa91b485f631418572024de34326
font_02_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1