Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbfd9bdf5679c39…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 08:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 260fd1d7c99476ace996ea267c107d0c SHA-1: 8af6587c26e8d38b9197c401077e19f327ae8d67 SHA-256: 9fbfd9bdf5679c390ec9ce922d1140670ba29a7c2bfe1d8d6e8391c5488ee92c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload from one of the numerous external URLs found within the document. The presence of embedded JS and external links strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/panl4nrq936hcq295lriiq1275/ratokasef.pdf In PDF document text
    • https://onlinendttraining.com/files/72453381058.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/5331204147.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/89101742194.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/30976015203.pdfIn PDF document text
    • http://petrduchek.com/files/nugevimuxet.pdfIn PDF document text
    • http://jinyezi.cn/upload/bixojotisid.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/61193655716.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/54705424300.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/33475750824.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/xederesuzemite.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/kebedifu.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zifamepofolijofuxodovit.pdfIn PDF document text
    • http://melabo.com/upload/files/89792766295.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/duwurowumubi.pdfIn PDF document text
    • http://orenprom.com/img/account/file/90571236600.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zemanim.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/48432239120.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/39827491634.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5b28e096c---14792741449.pdfIn PDF document text
    • http://kco.su/userfiles/file/tufepatisigaxelofare.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/25842016359.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/leposemukiwaba.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/lobuji.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613b7217d1aa5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=michael+porter+5+forces+pdfPDF 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_off0000afb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB5 14696 bytes
SHA-256: 23464f60ba4a9e5d7de699573fa78b5a33f0c234a5c5115904c625c7a134df3d
font_01_sfnt_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 10740 bytes
SHA-256: fe1ed7f999fb36a47470ffcba69a289302842eaba624047dc1fdc6ba30f610d5
font_02_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1