Malicious PDF — malware analysis report

Static analysis result for SHA-256 590fa54c7084e78b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 16:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 201dffa991d71e0f3df24e5f437f9fbe SHA-1: 62adb65df4c8a8c4d5b71bffcc71492b10d514fd SHA-256: 590fa54c7084e78bf2d2f772f531381e5e1e075b341d56b42c1bf0a401f81fe2
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The document explicitly lures the user to install a browser extension or viewer, and requests sensitive recovery secrets, which are common social engineering tactics. The numerous embedded URLs, many pointing to potentially disposable domains, suggest a link farm or distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://thebeautyofdesign.nl/ckfinder/userfiles/files/81559641258.pdf In PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/memamuke.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/takudolegadawilevul.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/widadotubewelatuduwok.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f637420ae8---22028224205.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/56795263298.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/vikotideguxigeni.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/63707804939.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/41352991495.pdfIn PDF document text
    • http://ipllaser.in/uploads/junofifuwufaxoverop.pdfIn PDF document text
    • http://vtaky.sk/media/file/talofunuvopalexekikoni.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/82123950274.pdfIn PDF document text
    • http://etnorom.hu/pictures/getebiridiridobokuwox.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/95326918873.pdfIn PDF document text
    • https://equinox-e.com/upload/files/95568549242.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/rokimabegi.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/dezejug.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/bolemogizawolokewasade.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/domapa.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pubigifezane.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/85527321600.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0bcd43631---xuvigakepibukilux.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/xupipi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/39874003310.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/80264100374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=offline+notification+androidPDF 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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 10328 bytes
SHA-256: eaaf4374564bb48f36c5d57b2f324f3f3cacb5357a632a4cd74a7f52c8c00c0e
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 18164 bytes
SHA-256: 1753a1566e96fbd0ab39e4a82b0a28a9ec72f87e00f1273670ec14e62749fa31
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1