Malicious PDF — malware analysis report

Static analysis result for SHA-256 c376eeea08c0c1ea…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 12:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f096dd30fc6e2e96d116fb7ddfa1846 SHA-1: 0a1abe5e25be460acbc4f30f15b4428f7a64fb56 SHA-256: c376eeea08c0c1ea57c7f09151e1b40d645eb4445c90cd5b7bc05bdd004dcfb0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs pointing to various domains, many of which 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 related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kimura-shihoshoshi.com/userfiles/file/vatogamovexufusemilobu.pdf In PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/46939998720.pdfIn PDF document text
    • https://bliznacite.com/files/54491637615.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/vuximizurolebubi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9c357675---xotivupifig.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/29696446829.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/98098780450.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/zivevaxixi.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/82930593806.pdfIn PDF document text
    • http://www.og2c.com/images/file/79212371932.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/46786096738.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mubimosekikisi.pdfIn PDF document text
    • https://avflash.nl/upload/files/kupapiveruvufibebexupug.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/rurep.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/72657475138.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/98915119386.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/54954017170.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/xiwotuvaxipotox.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210911_2d9e1.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57b854fac---rorolimedijaxukefagobig.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/59928381620.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/fobomosijozisi.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/34219933359.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/polaxulotagolifurexexujor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=robert+henderson+courts+of+heaven+pdf+downloadPDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 18092 bytes
SHA-256: 0b9fa3319770c2deab049bed9c5ef9a3a14ea215f52838c69d608a4b7318028f
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 11064 bytes
SHA-256: 96f4283ce748a11c0e986018de311e14d1dfa4a94a7aa5c7b048ce20f719233c