Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e85f35b01d26681…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 15:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7555fea15117b6752f3a328f3fb2e01b SHA-1: 31de04eecd51636e474a53457fec5cb4df204edd SHA-256: 4e85f35b01d2668119c0a338f33e51c69beb6f84a065bfff146b5e25c11135c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document functions as a link farm, directing users to multiple distinct hosts, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb260e5404---16527252096.pdf In PDF document text
    • http://vnationwide.com/userfiles/files/bagarojabokitivixokujoku.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/90206280814.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/tazetapipidokixexenob.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210915200109.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/megewixavipawiguvaruxi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ripozadijo.pdfIn PDF document text
    • http://blgjad.com/upload/files/66250500076.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/14947359912.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/pogijarasogigesoji.pdfIn PDF document text
    • https://casaalu.com/luutru/files/vefelijifi.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/wobudakavanuxotojel.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xaxaguf.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17777050223.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/dofujitemazulivaba.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/51607762243.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9ff171ca3d6d3b1fa191d89647735222/wexubinopotajetov.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/8627380528.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/82020205712.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161347410707ff---tofewewokupadi.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/21551397426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=poweramp+for+android+phonePDF 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16896 bytes
SHA-256: d39f89e750d3092d120d08f0df53e08b02f42e005f9aa0d5c9c2f18f79df1638
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10536 bytes
SHA-256: 0e1f31cb8b3df8f0d726d57e941507685f95f9c09c193966b30987980c7c6029
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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