Malicious PDF — malware analysis report

Static analysis result for SHA-256 856181ce1b9dfb92…

MALICIOUS

PDF

76.7 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: acc7b499e22249630928a9ef31d25408 SHA-1: d93ae9fa4e69c172860ae0321b7389cbfe632fa1 SHA-256: 856181ce1b9dfb92ddb11aebfaf890494cad08e0054c847a2728c6581022dd0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://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_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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