Malicious PDF — malware analysis report

Static analysis result for SHA-256 f540c26babebec57…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 01:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: e69ef4b4e1e502e29a0f5fbebcba458d SHA-1: 7f4d515da6cd345977b91b7a748823953c4687ca SHA-256: f540c26babebec5712831cee5b3ff1d5f668cd8d93463b420fc267b27fe3f976
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://studiozammuner.eu/userfiles/files/suwoxokodepizud.pdf In PDF document text
    • https://minlinart.com/archive/upload/files/2444311514.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/67680550451.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090035413341.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vukerofigobinijesose.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/94300284181.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zakuwinatozaj.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/midopubupajepuboxuvi.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904085219_6si97x.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/95636626872.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/mizaz.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/tojotuj.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/4108125905.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/tabipumuxoko.pdfIn PDF document text
    • http://polletnv.be/uploads/files/migafopaxuxosifab.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/tazodukigibamirexal.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/7450404267.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69591610117.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/volitewon.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/folen.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/6243850145.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/88414687034.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/85722784052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+use+a+smartphonePDF 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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16520 bytes
SHA-256: 4e0da01447f6c410072a3e995f17385238728b82f60be7d66df67a61555cfd0a
font_02_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 10808 bytes
SHA-256: 5e8ee822c9a337eb70ce33618b6c5be5eaf275066791d8f4eee14a3baf604bd1

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