Malicious PDF — malware analysis report

Static analysis result for SHA-256 f130495b36f79541…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 06:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8571e3605057f716a9649f4583037782 SHA-1: e2db701b098976e2df3b8a62e623e93b18b2319f SHA-256: f130495b36f795418f886f0acd06cf85349d97eb310e57f2f4ffa11116f8cbac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content through a network of disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing or malware payload disguised as a software download.

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.
  • 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://coretry.ru/uplcv?utm_term=download+video+editor+without+watermark+for+pc
    • http://tries.cz/media/images/upload/file/66650849133.pdf
    • http://ex2010.com/uploadfile/file/2021091109235373499.pdf
    • https://laplacedesstores.com/upload/file/tiwofedemol.pdf
    • https://markapin.com/calisma2/files/uploads/27456122148.pdf
    • https://novamakine.com/upload/ckfinder/files/wagenogozanadatatufe.pdf
    • http://hanlacsclub.com/ckupload/files/17869635726.pdf
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/90353896676.pdf
    • http://airserbia2009.vs.rs/multimedia/file/kapawipukureme.pdf
    • https://galedo.cz/www/data/cms_files/files/radukofifiba.pdf
    • http://pnlestari.com/visitbali/image/files/91232446091.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/vafaxiferawovim.pdf
    • http://miyagi.chi-kara.net/Upload/files/tobozemakisotijilaki.pdf
    • http://szhlfz.net/upload/visatupawogukevenower.pdf
    • http://phoiinnhiet.com/images/uploads/files/18071563313.pdf
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/tanot.pdf
    • https://lnpro.in/ckfinder/userfiles/files/40704532704.pdf
    • http://phukhoabacninh.com/images/files/mebalupidefamenurotef.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/61242558648.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/gamonunesoposakukerazuj.pdf
    • http://hrt-foto.hu/_user/file/lebopuxab.pdf
    • http://jgweld18.com/UploadFile/file/20210910143456706.pdf
    • http://tcsklife.com/filespath/files/20210912195456.pdf
    • https://habrit.tw/ckfinder/userfiles/files/sufowojedigesewa.pdf
    • http://taispacedesign.com/upload/files/laburojuvujaguzabeveg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE29 16792 bytes
font_01_sfnt_off0000c63b.bin
30d602ec5b0a41c583799113c851633d7579701f8ee36bffad782e01960a03cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 15516 bytes
font_02_sfnt_off0000ed67.bin
ad70bc226124fb8bf05b03eb216a2096afa60da2a89f89c95e2b6100d01457ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 11060 bytes

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