Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaab9f8dbcd8bc3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 03:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65bb563441bf85f96ccf015dc64664a2 SHA-1: edd69d824d6a3c769faf48573f1ab86fa13e865a SHA-256: bfaab9f8dbcd8bc3f412bcc22064a6531987aa293fedcc3defc7eb62637aad74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious content delivery mechanism. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://konchris.com/userfiles/file/1630775762.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/19527162949.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/76901731219.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614607ebe2c0f---20710217245.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/95229594749.pdfIn PDF document text
    • https://ibericadearmerias.com/file/jebijimem.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/mijagum.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/sijokitisetatasozusoterap.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161416d83925d1---vidukavovudukaxawadule.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/44531559189.pdfIn PDF document text
    • https://steammining.com/userfiles/file/52520489403.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/gozurakoporojuv.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kuwevu.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/47203096130.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/rediwefilewawegozezal.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/95669112552.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/musemufabe.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/42624856009.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/59077550144.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109121628465360.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/8808112936.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/94096030598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+search+recyclerviewPDF 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_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 10616 bytes
SHA-256: cd8792b68cb892b3a7eef21f248f30b8b8c8d48477d0785fc4ce2c0d97dea506
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 18632 bytes
SHA-256: 656b5e2b947a042dc9098c8d1816eb4c86c958e888d35e0a429de1aa48f2a903
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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