Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4511fdad70ffc33…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 19:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 550fbdc5af38fa0b66d99acca4160d7e SHA-1: 2b55532a60324d8a2d35c6a6ef66623cea66cd6e SHA-256: f4511fdad70ffc33b2e070580c8f5ac96a98baca4ffef7185542b96dcbfd0cb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains or are structured as link farms. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bem-sa.com/img/file/rovudipad.pdf In PDF document text
    • http://elektromig.pl/userfiles/file/tikokugeludete.pdfIn PDF document text
    • http://3m18.com/images/editor/files/34915205456.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/67227839690.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/levupobala.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/27953373772.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/xexilewekeniwov.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/weroxegipunopuwogureban.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/37990431125.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/delapibimonubu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/81086481821.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/24449170046.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/dunusimimolokexasivefezop.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/46936614251.pdfIn PDF document text
    • https://kildevangen.dk/files/22160025312.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/tanofufokibonetanebo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd5ba3de2---labarituvuzekarok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+create+animated+wallpaper+for+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_off0000a7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC008 10688 bytes
SHA-256: fd5e3fa18201ed9ee9494bd7ec884f55ac65fd37e780bd94bc0171eba4ac1555
font_02_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 16516 bytes
SHA-256: 125144eedc7893c665162c49922a26ccd619a4ad4c75315fa24812d9dc1edf3e

Open this report in the interactive analyzer, or submit your own file for analysis.