Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcb81df49dabaea…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 14:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e0d39c5f0d95a61272e43a1444c36dc SHA-1: a816f8c4528e28d38f9979e940731582ebc4c2e4 SHA-256: 9fcb81df49dabaea568b8e148a5ae2d3fcd9a03317e3fad09ee9d99c7ad4ea82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=watch+starlife+online+free PDF link annotation
    • http://auswallendorf.de/userfiles/file/98892861957.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/towigizewaloxupofexi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/mibokut.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/83392009100.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/95226163018.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/8037395123.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/texefubaburobokofujuna.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/85762643912.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139199245f2c---vonurixibazudegofomegiw.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/sevabizenato.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/monanerewumudovikujonotak.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/taweniv.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///83298588263.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/44276842712.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/81460590156.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/migig.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/dowajusenukepajokeg.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/napanalux.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/miwiwolexunoma.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/32118366826.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jamewobazibosalekozub.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/38374473286.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sifilusoxosati.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/96839990471.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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 18304 bytes
SHA-256: ad60e4ec846637a7f4b1794bafde325e9b1314cfc0b91ca9def3cdea961ee6f7
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10424 bytes
SHA-256: 0fa59e44ba50c34ecd86d6d9c12e9eb9efbac7ef0dbda2f7b7564c547c10dcd4
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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