Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f00501830e12ba…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 00:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a358d2a346376d1aed3dc3f735e03b6 SHA-1: 6eee5fc519601ed534e5f3188865a3339a1f4f3f SHA-256: 75f00501830e12bab6092c7f2f8d602d47a40921cc348cc88e7ecf9ab022f53e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crysiq.ru/uplcv?utm_term=words+starts+with+c+and+ends+with+e PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e29bbb9a---pesufejelipujibumefekoj.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/jafulu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xizubudufujinijovagi.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/15980649195.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/72784815687.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zoturejuvajosu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fbc42f6d7526486c65970e22ac34547b/55330124652.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/kesotowakovulokubuj.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/3905925034.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/57863581925.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/32687617435.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/rotoxivojalumoxosurewa.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/36292945284.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/xajiranujokulamudotufel.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/40003080470.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/46050782119.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/21251993634.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210917_DF7B78A1EBE8821D.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/34102359950.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/puvawunafivupofev.pdfIn PDF document text
    • http://stroi-sistema.ru/img/69233377892.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/90189601844.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/20287980904.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/vonutujozewelupotam.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/megokapawapek.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/wopogo.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_off0000c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 17288 bytes
SHA-256: 73d29729b65a16dc7edab6c646bde41315cfe5fefeb973851a3eff8208425183
font_02_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10500 bytes
SHA-256: b3e5a640aab6eede900808d434244f3895e4062fe04f3152e8805d1d3679eadb