Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35490d0e3f07730…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 04:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d91c3cb35578d5b80220cc4e36ee7ff SHA-1: 55c957fe920834904561bebee783dca200d5b9d1 SHA-256: e35490d0e3f077305721e79c7ab1aa890dab1ede32229cd6c54b38e4e26228f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are unknown or potentially malicious. The presence of embedded JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://kelvista.lt/images/files/19375734486.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c6831564---93306375447.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-4/20210904151506209808.pdfIn PDF document text
    • http://saint-party.com/media/file/woxepebenebutaniduje.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/88055877090.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/xinazil.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/xoxututijixewiwuk.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/23224178922.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///monug.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/bomok.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/30158483555.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/sutakut.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/40150594987.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/40923548868.pdfIn PDF document text
    • http://rts-3.ru/upload/files/tinunilubejubig.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lekukesem.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/gumivoba.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tijexibebetepenu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/tizebedagetavo.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905040537831754.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fedowurawared.pdfIn PDF document text
    • http://email-database.info/userfiles/file/gogamepufakila.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/kapozi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784ebae7ed---nanepadosolanejovi.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/9123131040.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xobikavimidikegodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=instagram+account+viewer+onlinePDF 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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 22076 bytes
SHA-256: 6238a933b72bb913f0151c75db6bae30b456216117cd85bd5a8eeff24f1bf936
font_02_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 10776 bytes
SHA-256: 79d6d86e1ef1ab33c2c7d50a5531d82559fdb97be8dd2c71baf003497c30846f