Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89ccd9c263c9064…

MALICIOUS

PDF

80.9 KB Created: 2021-10-31 17:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07884083c175b4e1fe41b233a04ed93b SHA-1: 96ede620a1be0b1bb7b5f3afd95439a8877f4b5d SHA-256: a89ccd9c263c906423c9f0174db612516377f556678b88f72c849356b6f2e9f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous unknown URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://csc0898.com/userfiles/file/20211031181236_3ua5bn.pdf In PDF document text
    • https://asiapharma.la/files/files/buxuxosiselomadumuzuli.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/20669277804.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/49405009231.pdfIn PDF document text
    • https://kalafiber.com/webroot/js/ckfinder/userfiles/files/47205693825.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/mudiwerozokukaginoxixopu.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/43071953438.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/fejerofeledelow.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/moribopasoku.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/taboxerezoletewifudojil.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/witipuzinerilufurubivaf.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46935122894.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/niwuvimarifevamiwemut.pdfIn PDF document text
    • http://centromp.it/userfiles/files/74754632558.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/jatulijiditifibewafunasov.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/7223861581.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/kuxiwef.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/65210066749.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/tetugogogedib.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/valerowefevab.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/64093432329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=gout+translate+to+spanishPDF 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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 10488 bytes
SHA-256: 99459338735460c90037532ec7162d903008de68bfeab5fe748fe348e697e0fa
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 17876 bytes
SHA-256: 5ceacf53b75cbb7dd10941c30bd35ee475b8ffd972305d3886508ce87dca48ee

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