Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5537b4bde305c2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 16:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9db325a6920bd38d4e0f568187c9e63c SHA-1: 8293c3dca7dc8999515c1be02ef96b93e2e786ad SHA-256: 1e5537b4bde305c29c77f367973b1fe75e3781a7f6e3eba13ccb0083b9fe0c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable or unknown domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cpbnatation.fr/fckeditor/userfiles/file/wudubesufumejinawuk.pdf In PDF document text
    • https://rintrans.com/files/zujosuxi.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/15077249326.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/40615544350.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/74716597291.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95753722002.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/48047085227.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/xofunemila.pdfIn PDF document text
    • https://renault-service.com/userfiles/duranuxodewumu.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/22443952809.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/vumiremixinumumakotalowil.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0cfaab14---romodarizugogizi.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/38065265922.pdfIn PDF document text
    • http://thecuriosityshot.com/69393327733.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/povedesiweriwopaxukaka.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/97652867885.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/89920300003.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/86353868368.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/lasodoridazinakemobupod.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/64156152319.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6fc8cc643---moxokulasozigomepuluzuwot.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95649641494.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/86158051925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+opencv+cameraPDF 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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 10412 bytes
SHA-256: bcc27131113767cc20ccc7c97f53fcc7658716bf98366f943737cd769a1ce256
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 17836 bytes
SHA-256: 79b70f72b42e3b22c2ca04b3801f0383ff85d7d0c9db8970fd182cb28016a9e4

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