Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5a96718088ebe0…

MALICIOUS

PDF

107.0 KB Created: 2021-10-05 05:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7839ea8ce4fe58f0846757f5d8600280 SHA-1: 3cf10fdc28c3bebb8bd50529860a39a1d0d9b19d SHA-256: 9b5a96718088ebe05a4c4936f5b9c4d4f2a8a7d299fdf3d12020679b65a2d9d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tootingtaxi.com/survey/userfiles/files/xuxefeli.pdf In PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/tutodivufujexunatemomire.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/58597137699.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/gedajufixegurelomare.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/91799061548.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/nibusumore.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/fafiguwaku.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/27608485244.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/madunesevilunude.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/90249023638.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/degenevinowosowiv.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/rimabumizarojubinexoga.pdfIn PDF document text
    • http://autodilygood.cz/files/file/87368398243.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/5540628482.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/obs14m6sm5m4jr9bmeklsjg4g1/lazogofeboragukijilatama.pdfIn PDF document text
    • https://taflanelektronik.com/img/userfiles/file/kofuludusabomaguvefug.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090503544654.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/samiwexok.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/65218308924.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kufebagupo.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210902045707.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jekonafefufate.pdfIn PDF document text
    • http://asvpp.fr/pdf/gililevazekapagibuzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=100+best+singers+of+all+timePDF 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_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 10772 bytes
SHA-256: dd55bf9ce0c6481c1a7e471612e8564dc51fe5e36ae6e1b0d1049f2864724fea
font_01_sfnt_off000150aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168BC 20688 bytes
SHA-256: d809e85c573b8e50d82d2ba47117fc2ca9e92735d22ac112d4274cc5b4f79a6d

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