Malicious PDF — malware analysis report

Static analysis result for SHA-256 187c87a076d58bff…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 03:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2caaf20188d1c41e398a741f6215f486 SHA-1: 6dc82c9b3db69ac3be3353b8c8de214315dd9fe3 SHA-256: 187c87a076d58bff6e91552a09dfc95ca7aad1adba39c1dcd7b27ad052b8c668
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple URLs suggests an attempt to redirect the user to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=rise+up+premium+apk PDF link annotation
    • https://svezadjecu.me/userfiles/file/mogujikifek.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/63001989138.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fuxezegetojotumubegiduxuf.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/49706469029.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/72620015531.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef34b03162---54905601256.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/nidezujepabana.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/67131012648.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/vituvufo.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/solinel.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202192527451122.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jomir.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/32355776816.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/70472211893.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/18221610398.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xonajoji.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/walitebubimotakijavugosa.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/lewalarusowawufalubuwaf.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/98591157182.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/57558638532.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/mexoromi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/memevirakaxobugem.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/siravawowunanu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/84580518713.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://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_off0000c8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 17528 bytes
SHA-256: 59175bd3f6419a2b9337d3fdee2aa010c4b80bf8e4adc1d4d0107726b6e7e957
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10284 bytes
SHA-256: f5bc01b10bafe8aafbc2d0f490ca5259b851a153ab9883b7f6728aba1e482284
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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