Malicious PDF — malware analysis report

Static analysis result for SHA-256 790378a99735b99c…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 20:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9cc3003ec43e8a2bff2dcd11a900a679 SHA-1: d61a60021969e29ae19b4f0757b757a3220c1b43 SHA-256: 790378a99735b99c95db13c13567e427a577746df6ac48a4d71de63845c03f04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/kepomebaginorurovuxebi.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8ea6767d84246d34d2185023ad4e694e/gadawubejalutetovi.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/bozubunupetugagomodu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d494f5f601---lipevoseriw.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/91652147808.pdfIn PDF document text
    • https://vzglavniki.net/data/file/85882769474.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/sipeweluvegukubol.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/pezanukekonomibozi.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/gezof.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/51942114633.pdfIn PDF document text
    • http://unseretochter.ch/images/file/96234580894.pdfIn PDF document text
    • https://binhvi.com/upload/files/39660144749.pdfIn PDF document text
    • http://askort.pl/Upload/file/demufopaf.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210910101219.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/60942264472.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109231622344513.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20211003011022.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fopilewineb.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/43145343677.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/78412534589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+you+want+to+do+mba+best+answerPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/78067463795.pdfIn 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://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_off0000afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 15704 bytes
SHA-256: 011070da52bf79f3392b70c16bff021ca4b8dff651663c0a4291befeec41db21
font_02_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 10808 bytes
SHA-256: 47ff22679e74fcbd1821f5a58ce61034ee4d2d6621109a7897c2d595c4c0b3a9

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