Malicious PDF — malware analysis report

Static analysis result for SHA-256 5607ea1d954c4724…

MALICIOUS

PDF

70.4 KB Created: 2021-10-13 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 83bd961bbcf58aaaae7bac165cc9c338 SHA-1: dca97e923480bae3fbe53df8b89c56a86136ec13 SHA-256: 5607ea1d954c4724f9202f278486e9c0937315adb96af9af808a8db6363073ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the sample is part of a link farm, and the numerous unknown URLs suggest a distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alrabbancapital.com/file/files/34329949011.pdf In PDF document text
    • http://planet-for-events.de/userfiles/file/wupezikumukosinum.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/buwugofurisimukaloxonuvo.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/91283353691.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/beputub.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/duwonutobelevusenopoxamod.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20211004044825.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210926185917.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/79937278082.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/falifulalanuzilal.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/99150666312.pdfIn PDF document text
    • https://ewt.cz/res/file/vudanetowo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/damodesarip.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a09149c08---muzewovuto.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pubemafu.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/nujuzomevebodutuzorezomu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/tujopirepajisapiwuv.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/6504421458.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tedifo.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/68241165200.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/93484766061.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/4474897226.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pirixin.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/likabuziruvujosogim.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/piboperi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=huff+how+to+lie+with+statistics+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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 15264 bytes
SHA-256: cf7d4034535284428989a8cc7f63a5cd1cce18109b47234bacedcf356fb40c75
font_01_sfnt_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10688 bytes
SHA-256: a32c16622c4a6bedadd646c68985103d30ebf24cc5e49f8fba48ee84f4771004