Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e951e7554c4f504…

MALICIOUS

PDF

73.3 KB Created: 2021-10-03 03:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8b4ef2e823e1278fec7c0f97cb04bce SHA-1: 38ed1836ea101169e374fe1d0b5ed0290fd47f54 SHA-256: 9e951e7554c4f50455e03c5fcf4689baec7a4f0d82c5a3c0cb72ea08fffc87cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oncallanatomist.org/ckfinder/userfiles/files/30724740867.pdf In PDF document text
    • http://megalabsrl.it/userfiles/files/lavujala.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/54921751118.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/kividozidinisi.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109151837034657.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/18366119357.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/xabijuponefazova.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/23090442797.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210919040038.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/xuxijabemadobinojubifeg.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sozumebomifo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/xutawus.pdfIn PDF document text
    • https://davaocarrental.com/images/file/24407466184.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/31999449566.pdfIn PDF document text
    • https://marosme.ro/hirek/file/9802684126.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/31693009446.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/74404405833.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/rotokeza.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/lamubadewevino.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/50548626973.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/587f6126f2fac4ba38baa400c4108558/54377874679.pdfIn PDF document text
    • https://vitanov.rs/files/23691386282.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/ferim.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/gewok.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ligoxorupezomujamogagof.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c167b25f83---90126783516.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dulejapazivexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+computed+tomography+scanPDF 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_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 11020 bytes
SHA-256: df7a5e67d6d00c0154ce424ae878acfc30156c406392db11d67aed19286fed13
font_01_sfnt_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 17500 bytes
SHA-256: 579c9e0c277f9ac084b1bdaae290f52c3bf3b106303f38dd92bc26b2b15f5bf5
font_02_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1