Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad06f19e12b3de4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 04:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b9b5f735e76923a682a50c3eb8ef1d7e SHA-1: dc342a533596edf18128ad858fa7a7b76087fb4f SHA-256: 4ad06f19e12b3de4a4d8a7bbab4a5a930e3af083b10f8a5185e6f237fc81ae27
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://bandotrading.com/uploads/file/zomoditidatekiba.pdf In PDF document text
    • https://halkum.rs/files/33154978446.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_2E0DFD684ECBEB13.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/wisamesugowo.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xitajuveburabubezites.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/53026169565.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b964a6bf75---65528250202.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/tedibeder.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wudovowegojolekuzolojevom.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/xufalikobugedip.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/negur.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vesepezabutubu.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/55930348169.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/32723933468.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/86090205730.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sufaxax.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/paveririfilezikelabaxanet.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/sifiwuwusewegod.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445e6f3976d---mezawekot.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/lugepesuvurupodoza.pdfIn PDF document text
    • http://pneusmarene.it/images/file/40423429761.pdfIn PDF document text
    • http://packturf.fr/files/xomijerodirage.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/32477426993.pdfIn PDF document text
    • http://netflor.pl/upload/File/73298053297.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/gozobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+display+phone+screen+on+laptop+using+usbPDF 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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 11224 bytes
SHA-256: 12a8dadc8eeb84dfa701dd61bd55b855d28bbdbcd64706914033cd264b0ec482
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 18848 bytes
SHA-256: 229c1dc59c93274fe2804710db5da9bf6185fbd3df422ab9e0f940f2f6ce5369