Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97b308fb1405c9a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 17:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93ddaceae7c8ba04f9f221c9357ebf71 SHA-1: 67c4a81afe5833db29a2deba8d33a43972feb25c SHA-256: f97b308fb1405c9a04e739d96b4c6988d98d9363a8f90d056b8c91a3c802ae90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous extracted URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=friv+garfield+haunted+house+1 PDF link annotation
    • http://mikailang.net/userfiles/file/20210908070038_300662726.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fadexijamaridetagogifa.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/zojoxevenenolorobewo.pdfIn PDF document text
    • https://tebra.si/userfiles/file/kasonejuvixotosozetaxo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef50137e62---xigiwarakuvejukusamofenev.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9b427fedfcf2152b9cdc9c55ec63fcb1/vonura.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/venanegu.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/52848633948.pdfIn PDF document text
    • https://tpk-m.ru/files/file/rimelolobag.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/taxasikevepujusaz.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/2958851387.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109050122458397.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/64184799776.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/dobuxegosezovuguvivokabik.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/72974448140.pdfIn PDF document text
    • https://gornjastubica.hr/files/8502750473.pdfIn PDF document text
    • http://dalaichau.com/files/jowezulizozuxodominemakib.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/67906855882.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/poxuxepinigomulivosule.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/nijafitotusosane.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/882634688.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/wimufatuwa.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/gidazidositawesodizat.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/10850670013.pdfIn PDF document text
    • https://ismart99.net/upload/files/texokaj.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_off0000b7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E2 15836 bytes
SHA-256: d6997efc119ad63b6aa9f4f870cdb63a93b3f57e4dfc9560cecf03927c786d71
font_01_sfnt_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10828 bytes
SHA-256: 069048d92f0fb0ebe6102cfa9a98360d46617c8f130aee2ecbec41b1751e4780