Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f27c0f208813c5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 10:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66c816c75428bc55ee574569a577609c SHA-1: 27a473481a513aa1745354b1439bbff86c446768 SHA-256: 91f27c0f208813c530362d4288d68631c4d2fadb31e8d7ecf4aadfa9d3c47aee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a payload. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://orchid-daikanyama.com/userfiles/file/fofopowomasi.pdf In PDF document text
    • http://bebelino.ru/userfiles/file/vazekadegupoxizopofo.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/51209026269.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/34698428324.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/83982257703.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/bebafepufakadezof.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/liwetajozesoduw.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/34818287887.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/bivuxakofowuxaveboda.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908171900.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/6062353766.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lidiwinubarulolodebi.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/41254484741.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/37625710754.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/tadutamovunudupulix.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/25348307348.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d92fc5568---zoveruleledomataja.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/56162479514.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/getozoxobuxewomorujamak.pdfIn PDF document text
    • http://minhanh.com/files/68206180108.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/danolerojenanadu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a335d149---90694158621.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/riwasotovegejuwamug.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/vofokenogemevedogirig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apk+express+vpn+proPDF 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_off0000b8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FD 10088 bytes
SHA-256: e56786b47ae191974e4f9adfe378335a5d703f7f46f37e0ad96f3aea0d8a4d5e
font_01_sfnt_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 15020 bytes
SHA-256: db3869cb1401ed8b722c63cda1cd795604571576d507996dc32df5b58f281c24