Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd7c9b553b91b7…

MALICIOUS

PDF

115.4 KB Created: 2021-10-29 09:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a1433585773d3ba50872f1ed3320e2a SHA-1: e9b373065c2fb2894aeaa39e0b0bffd9f229716c SHA-256: aefd7c9b553b91b7355368ad1e855def6a3f80928c1ebafac6bfe9f23d6792c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting an attempt to obscure the true destination or spread malicious content across many sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tysons-cafe.com/uploads/files/29868608978.pdf In PDF document text
    • https://cailux.lu/userfiles/files/xetusetiteloletop.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/89259603233.pdfIn PDF document text
    • http://atomleasing.ru/media/File/6221777344.pdfIn PDF document text
    • http://michigan.easydefensivedriving.net/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/83506300836.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/18957192947.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/85749441742.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/35327640154.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/ronovijarenudavuzulu.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/85053796389.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/66973750908.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/xerowogizatuxanofi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oqp05mofng79gs1lt6kjplmiq7/bepawuledugipimod.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/28392024530.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/numonekozutijovalavoret.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/7839211928.pdfIn PDF document text
    • http://maulich.vn/attachment/files/34488874727.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/puduximofigaxomitomapejiw.pdfIn PDF document text
    • http://minjar.mebel18.com/uploads/files/wonibab.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/49617966184.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/32531290973.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/33560122701.pdfIn PDF document text
    • http://modero.vn/upload/files/57701853551.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=stem+cell+cloning+pros+and+consPDF 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_off00015e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E25 18468 bytes
SHA-256: f572e668b685c099b4e04e0f3385d3887689a1951a8ab579a3550fc8e347fd71
font_01_sfnt_off00018ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EBB 10932 bytes
SHA-256: 283e90dd8cda9356d08740ea5bcf09b3b4f11dee356c1aa5899ffb544c5c6c15
font_02_sfnt_off0001a7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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