Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a3475b25dd78d7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 14:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14e409a3965330046367b21811fcee57 SHA-1: 0cdb3e1907fb2dc1971b559682316d296af68251 SHA-256: 26a3475b25dd78d7442abb2d05210da806ce9ab94fd3a5868ad62e188eec2220
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=pragmatisme+philosophie+pdf PDF link annotation
    • http://fmi.lu/userfiles/files/61317434122.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zikaforonetolumumonap.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081159086611.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/15735030901.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/jazenotaw.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/72968683488.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kudexisojewikadovosoner.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/zikafelabavosazipusiji.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109070816546217.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/19295136551.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210902170446_973451337.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161337a1f5671e---98019084091.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/wuwuko.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/83197018445.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/27458868770.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/73129423164.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pogotukebivi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/24473467984.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/tozewazabepomuluv.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/49169658514.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/tijak.pdfIn PDF document text
    • http://jawarakreasi.com/file/matunawuwasabidipufepaza.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/35184499435.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/84944902994.pdfIn PDF document text
    • http://cochemical.com/upload/files/kanopo.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 19116 bytes
SHA-256: be6af0b1846d7d6100e504de976a93f9ef98f8554b60432e1efe5e6ae747ec4c
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 10840 bytes
SHA-256: bd7ab691a6fdc7417514172b069c9b9fb528d190e7c3ebf42c9cb6bf22fef4bc