Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f032c3699b8c172…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 09:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b042d103e22aa85d14e5f6e34bb3cf SHA-1: ec3a4ada8c78c47079f1c0dcb09e08a288fd6a31 SHA-256: 5f032c3699b8c1729838fbc1514dd94a30ddaa79a05de996d48e5df6e562d31f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and multiple external URLs, flagged by heuristics as a link farm and containing a deceptive download button. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external URLs suggest an attempt to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=playtv+geh+3.5+apk+download
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nupojogesevub.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/35340305406.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/83355847779.pdf
    • https://cartolmania.it/file/zubeludutunu.pdf
    • https://speakingparrot.com/upload/ckfinder/files/93786309139.pdf
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/62069182846.pdf
    • http://studioriboldi.eu/userfiles/files/67173368910.pdf
    • https://yunglin.com/uploadpic/files/33226122166.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d747a5157---biriwogogabazoxikuxa.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/17878136658.pdf
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/rasetup.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32654118487.pdf
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/kejubul.pdf
    • https://vvpta-irvine.org/userfiles/file/bakabudi.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132570ddf9ba---76056764030.pdf
    • http://iktoktatas.hu/files/file/55358967819.pdf
    • http://computerdoki.hu/user/file/lapumikiwewowevibadavu.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/94202640344.pdf
    • http://stavo-bazar.cz/userfiles/file/21603214232.pdf
    • http://www.extramas.com/userfiles/files/wudizozodevetujivefuru.pdf
    • http://skpizzasubs.com/uploads/files/36272530264.pdf
    • http://shbaicun.com/userfiles/file/2021090804093973499.pdf
    • http://v-lukomorie.com/uploader/files/jopoko.pdf
    • http://ipceurope.be/assets/file/2743818130.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_off0000db35.bin
f18d6707c4e5dd509ab00ff3477c78ff28b1cab2a4f3492fac5ecb40fc5d52c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 11044 bytes
font_01_sfnt_off0000f4c9.bin
017fc35afedc9a9a9b503e190df610a36483bb293393ee89f85ce658405f1f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 20844 bytes
font_02_sfnt_off00012a2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 16792 bytes

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