Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fb86bb797a6182…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 15:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 484175bc88f292483172891a662e37e9 SHA-1: 2ba4b2d4e52eddcc852c7b341d90599674befe4b SHA-256: 89fb86bb797a6182ec2448e10bb67f03ad2a93009314a21199df8ccca1aaa73b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as link farms, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=test+de+adaptabilidad+social+moss+pdf PDF link annotation
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/46114998806.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/veximo.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/46032400591.pdfIn PDF document text
    • https://manenshop.com/upload/files/sugis.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/lonok.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/46243386267.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/nuvezijasuwixivav.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/8998142980.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/9844073824.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/43825127244.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/5101076837.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/nanamikenozixopidisobov.pdfIn PDF document text
    • https://jetaime-shop.com/files/fepurenut.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32498559280.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/voxabajopawuvujakosu.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/pexofinodozisogepexukon.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/pexonizojezutuzav.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/62417231150.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/95288993752.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/zatabotixezuresu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614040914f3ca---74285377582.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zosukoseluwe.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/51816762898.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tupanezaluxoguboper.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/molixodalodinavofes.pdfIn PDF document text
    • https://aokman-drive.com/d/files/kavosidizasafuvopipeda.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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 19724 bytes
SHA-256: 607337cabfce03fb03a08d383673ccd8bab28071ec5e17f2b84572eaccad98e0
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10680 bytes
SHA-256: 71c3e037d3c8fa26f9cb81ca6b54da7342dc1f32d803c0a845d3775c14fcee2e