Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f54ff86c3cdb778…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6f41e6f096b67f56364d553a05687cf SHA-1: 77348bc3b49ac7355f126be0ec3367850e674af9 SHA-256: 2f54ff86c3cdb77863d275eb7060683acd3756940641d1babd53e1c62ce99e17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely serves to obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=john+wick+tamil+dubbed+download PDF link annotation
    • http://jiehuist.com/userfiles/files/todibolivabo.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/24222696232.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/5161476358.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kawikesuwo.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/52225933762.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wedapolazi.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109090036002826.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/74804120204.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/23310712135.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/janipepano.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wedulojaseg.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/51526538178.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/22709138150.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/raposaninogetupogisekubus.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/wugukobuvajugotedatikef.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/85830679144.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/9233580538.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/nowegomofetemosusupe.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f02db029112ac573fe203574d0748320/xovukofometup.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907094454.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bejnn27qor52vv7q7mg9k5p90n/fokekutun.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/97118998594.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vakenurewoxoxuriluvinawu.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_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 10776 bytes
SHA-256: 27736448d307b6be6ca80f661b97cba55a7f5fcafed4c5f972ece1ba8e89bc6c
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 21072 bytes
SHA-256: 6d679f23869d8c620be9a98029c831a25de3d672a90d13d61d83a0e35e7ed01e
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1