Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0ce081bfd69dfc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 15:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7654bddf7abfbbb761a2236d9ce51c82 SHA-1: 45e786b371489e37d9ef500142c8865e397e786c SHA-256: 8b0ce081bfd69dfc0bde0f01b453dfa3a7c3e8ddd33daa43850b233fdc9b1c6e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate the PDF acts as a link farm on disposable hosting, with one URI specifically mentioning 'retrieve photos from broken phone', suggesting a social engineering lure. The embedded JavaScript is likely used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=retrieve+photos+from+broken+phone PDF link annotation
    • https://rh4-h1tapi-turbo.com/contents/files/vukaso.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/napipexadamemefot.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/79639150153.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/90937158312.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/94752005493.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/forumebonoxuvusinatomewam.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/patuberira.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/sazujifuponipifobiwupofe.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/tuxebelitafojufi.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/78062616085.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/39968549543.pdfIn PDF document text
    • http://fruitvita.com/files/files/39573356847.pdfIn PDF document text
    • http://ewtch.com/upload/files/31315542797.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210901211650.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/16945868174.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/99746979247.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/13081926257.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/53658182561.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gutito.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381b8f81728---foraveganuwasowaduxa.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/pudoxalujenosev.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/60563857653.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/60047389543.pdfIn PDF document text
    • 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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 10756 bytes
SHA-256: 43df484ee89bea3e9ddd80afe1a7b0ba6c64a857402f4e559670beb3f52a9042
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 18704 bytes
SHA-256: 8002e5a0de707d5fb6be631af6988d7afe1e01b41c1b36a23cf3a7d4afd45b0c

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