Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a251cda18faa25f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 04:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9af02bcf5adfca26ff474fdafcf32f3 SHA-1: 26edaedf0ab26f6a3b02b87c40606d681028c171 SHA-256: 9a251cda18faa25f87360b8db494cb4603d0c4c7b2af38afaaff8e606f406b33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://cleanking.net/userData/board/file/gerodu.pdf In PDF document text
    • https://npkfertilizerproduction.com/d/files/26018640263.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133c277ce38e---ponipalutovukemibido.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/fiwapog.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/puvasiluvus.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/93073245892.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/poxesedapuvaxusokedum.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/ketixotenadatibo.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/52156170715.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/97117916427.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xowawodezubemo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/lulejutijulev.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f060e6ace---52242911625.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/50198946093.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/luvupofo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/meguka.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/rifetisinofiwife.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/newaxedug.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/35914845742.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/riduxeterujuji.pdfIn PDF document text
    • http://gr-chem.com/upload/files/kizoxusetuxifosamudusi.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/70733365235.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/43132236329.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/34072377936.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/54414325918.pdfIn PDF document text
    • https://fuoriscena.eu/file/47620081664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=quickedit+text+editor+proPDF 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_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 17516 bytes
SHA-256: 0884e1e00c3fc3bc41eb5ef96c1bcf0919ff392ba86a6d3ab734043c3a89f8a6
font_01_sfnt_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 10380 bytes
SHA-256: 239cb0dffc4d21da36eafd30b2dec01e7fbea26efd778a7db1c7d85df5cc6e48
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1