Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb52e76264611d4…

MALICIOUS

PDF

72.2 KB Created: 2021-03-20 18:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26f31df7da4a4ad87f41df0411fc071d SHA-1: b0fa42bc1847076deeef88d380e543c10e014b78 SHA-256: 2eb52e76264611d4482deb05bdcbfc5337278f88ba0f68bed1240ee8c0f15e60
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=login+design+template+android PDF link annotation
    • https://wodosokereso.weebly.com/uploads/1/3/1/4/131407547/2993818.pdfIn PDF document text
    • http://maroron.22web.org/update_bios_acer_aspire_one_zg5.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/sevojebipuwobovonoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_600146ec3dac2.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/46da7.pdfIn PDF document text
    • http://xojitufos.66ghz.com/how_to_go_on_sugar_detox.pdfIn PDF document text
    • http://bosivutefap.22web.org/is_toyota_innova_a_good_car.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_600b93953fdd3.pdfIn PDF document text
    • https://sizasoko.weebly.com/uploads/1/3/1/3/131384227/98a047c0.pdfIn PDF document text
    • https://gudetopop.weebly.com/uploads/1/3/0/9/130969639/1102726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_94753a0cb5c34fe1bd88b26041cf126a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/how_to_get_osha_500_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/koratokaxekurexemi.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_284592956b30444a9d26887645760ab2.pdf?index=trueIn PDF document text
    • http://beminelo.rf.gd/refrigerao_por_adsoro.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/41881409522.pdfIn PDF document text
    • http://xosufatobula.rf.gd/ladofuvikosu.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_fa2628af44214211922e640c9821a064.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/mepodofofig.pdfIn PDF document text
    • http://mowixir.epizy.com/eragon_book_4.pdfIn PDF document text
    • http://nodezolejew.epizy.com/48929400753.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_6a987e781c0a41fdbcb8c46668ec7b40.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 5220 bytes
SHA-256: 7717197cebf01a07c003f793038829c9489b55761a0f6d5c229fa7955929edec
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 9940 bytes
SHA-256: 198a8a0d00638da4e3cedb8256c8dc784a122a334d8a6fab8b3b2b1b6b52cbcb

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