Malicious PDF — malware analysis report

Static analysis result for SHA-256 c572f16e87dbca10…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 16:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86d5798e613bafb4d4a6d76f21f1b97d SHA-1: ee98b2b6a2e33ca0fb1e0c2a53172d653e64ce0d SHA-256: c572f16e87dbca1073ddacb25af9831b4f1022b288ecb874dde1eb8ebcd48867
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the high number of external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery, aligning with Spearphishing Attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • 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://crewmak.ru/uplcv?utm_term=fast+and+furious+8+movie+torrent PDF link annotation
    • http://hamdannepal.com/userfiles/file/xadudedivotufejedurami.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/4145760288.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/97942369148.pdfIn PDF document text
    • https://salonrewards.ca/images/file/mamoraroxamajile.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d82626deb1---80358554452.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/111113638.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vopokasiliwetewupol.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/ruregiben.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/sojuwagikakemo.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/63878647787.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/94029268885.pdfIn PDF document text
    • http://artepcb.com/upload/files/kutezagefexegutamagime.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/tojelefim.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/30101373868.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/54324065208.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/22931779385.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/xeboboberatagevamutuner.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/38255250696.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/44838500656.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/vokixid.pdfIn PDF document text
    • https://maria-galland.ru/files/file/sisovavumagumipinaxoralu.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57356886674.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/mogigi.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/junerubamobafezivi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319a2b419a6---jomaletudesazikazorixa.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/2781579409.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 10820 bytes
SHA-256: 52e8b26e8f7345fa23df9e694bbe617df7609a7e230b794710ded8919ac2d7e8
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 20736 bytes
SHA-256: bee3b632feadfc25e9e597769e6565ca82037b008747784ce780969e37f78926