Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c3935d0ed5b18d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 07:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2a4ce24911e7341f6ec843422336893 SHA-1: 780c13d6807e6393879293b05216c5712cca81f2 SHA-256: f5c3935d0ed5b18d3062bd5bc170915bd71989352204e9c1934df4275619ef76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://viprealestatebrokers.com/userfiles/files/vujebabawuj.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/58217979608.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907190847.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/57509621420.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/nenasiraxawubuzilunimatel.pdfIn PDF document text
    • https://kimcert.net/E/file/wigapepisem.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210906_205102.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xapikavixabe.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/73446373112.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/lizirusadomeleruzepik.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/peropuberiwivoraxebirij.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jikero.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xexojiser.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392c86f0166---97875581987.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/8313567821.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/57517976217.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/zakuvisetaxi.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/fotagi.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/nususor.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/levojanubigubapemapag.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/91819299138.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ab4450aa---gerugexiradusufe.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/42624856009.pdfIn PDF document text
    • http://www.77ice.com/upload/files/4430377402.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/nevajago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mxq+pro+4k+android+tv+box+firmware+downloadPDF 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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 11196 bytes
SHA-256: dae17bc51ea802d585e845fd3755c93115b3f18f291daccd7050a7473c5f1aeb
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 19804 bytes
SHA-256: aef9111740abce213e208b987abe318f09023ffdc8263d98a78d70ee7fb82ea2