Malicious PDF — malware analysis report

Static analysis result for SHA-256 865c26ba3c4a3479…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 20:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e25ffe1897b97a14bdca560b1d71819a SHA-1: 2e9bb2e2259b3c304b128df113b8cf0bf8e63ed3 SHA-256: 865c26ba3c4a3479ef918f5f97f77a4426a21293a32ec2485bc9cf63fe1022ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable domains, suggesting a phishing or scam campaign. The embedded URLs and the document's structure support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://ashleymongolia.mn/uploads/files/rixeniwumibub.pdf In PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/rasesuwusajelovoruga.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/rexijoxefixi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/75813936880.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/zabebimoma.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210909_F57C18F940FEDBED.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/37861319538.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/waduvaxafofina.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/fugakejus.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/pukogifixig.pdfIn PDF document text
    • https://robodom.si/files_vsebine/tedupuvupufo.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/karugexibevesujupezuto.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/44123895238.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/97027316025.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3ea213aa---mufenako.pdfIn PDF document text
    • https://mattress-leader.com/media/15775112922.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/15619167207.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/72861711361.pdfIn PDF document text
    • http://wawa757.com/uploads/files/baruwozisudixi.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/jebedufudaxinedubezeror.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/89868301443.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jezeva.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/89313808371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mod+siren+head+minecraft+pePDF 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://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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 17508 bytes
SHA-256: 7c4113840e4ca9a835077657aafac2935488c898bdc8a2359be1ba8269ab8294
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 10832 bytes
SHA-256: 965b2f373003e5ec5f760cafae949d8abfd0611e8b7b3238fb7a251b3679a671

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