Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69d21b4bb4a89ac…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 07:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3499dfc22cfa44d45e3569b135beee29 SHA-1: fe004729ca87b85518cbf92ba702a2d47bfc765a SHA-256: b69d21b4bb4a89ac018d4e4b57458c1398662c885520793c92721929793cce4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://testplanet.nl/uploads/files/38280057942.pdf In PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/78652437649.pdfIn PDF document text
    • http://8njl.com/userfiles/files/80036486266.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/73919217264.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/fivobivofex.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/bogosuxire.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/84275957724.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/kifen.pdfIn PDF document text
    • https://termoformat.md/img/files/4311824568.pdfIn PDF document text
    • http://boldogelet.hu/media/sowopof.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/vasobofexi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8573dba0---tesujotoxenonuwororapejin.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/roxusulinibibutixi.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/3568408989.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/wepegibopenuxugiruw.pdfIn PDF document text
    • http://balone.net/_upload/file///kages.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/kunubiravonivexotowumisi.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fopewa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613333569b2a3---30164673039.pdfIn PDF document text
    • http://emaaravm.net/upload/files/84087618102.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/58534391223.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xidatajotemipiru.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/49093078137.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/54432499926.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/gozebarigezujizukenolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=offline+virtual+gamesPDF 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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10628 bytes
SHA-256: 406d656c2cf16c8fdd768325466cce71141119783e621f3507ff535883ce29f7
font_02_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 17780 bytes
SHA-256: e60af1fd601b6ac5cd14dc42911860c32325b25c7c6549d7bd08e156e57dc06d