Malicious PDF — malware analysis report

Static analysis result for SHA-256 459f26d365920e00…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 11:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aa6b35c2fa50cf7416b3ef5d793d4af SHA-1: 3d50e876b4c1b5e7ca14f1fcd3020ef5b2cb2c85 SHA-256: 459f26d365920e00b6dcf6ef928924ea8ba4384512118b24eadbfa5d4bd1fb2d
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download and execute a secondary payload. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document's content is designed to trick the user into executing commands, likely to facilitate further infection. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://inwebjor.ru/uplcv?utm_term=print+pdf+from+command+line PDF link annotation
    • http://badgerhillfarm.uk/10530322715.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexolevixomidumefaxirub.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/lokugefasiwapo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/jogor.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65686829016.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/10757151729.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/vitonizazerugugopu.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/defoverul.pdfIn PDF document text
    • http://vladekoservis.ru/files/7807751429.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/mukapokalowuruf.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/nizowumipuberid.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jagofikawojizemonun.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gexajitumanukuv.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sulokuz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab70d98e9269165332800fbaa9f47179/20868835916.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fefodideken.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/berokusobivef.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/35567029815.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/luxolewarifuguwavax.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/zajoven.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/49d3614dc2c7da9e3ae58eb7e3388990/tirevume.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/40540414016.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/19970584296.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/firujujiv.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10616 bytes
SHA-256: 666a94f48a88dc4037d12ffaac74effacc531c5ffbd52ea1982aec47cde9595f
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 18532 bytes
SHA-256: 69b4f92fe522c531e496c898c3be8627f493ba54ddd4cabe1ee652dd2ed5c67a