Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c716731e869ff3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 07:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0cd5bd65e28294c5c66c07e13c06c03 SHA-1: c303a5c93107a7d93a5fdedbd99453624cf5ec27 SHA-256: 12c716731e869ff3929a8d3fbdf818cccb0d9ce5e842eb74c685ef271414eab0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://ifa-astrologie.de/userfiles/file/64204385243.pdf In PDF document text
    • https://girilawfirm.com/content_files/files/tarijibawupelufukawe.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/76863887138.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135983911294---48935629685.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/wigemikasenajeduluvi.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/zorewulagalowumigu.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/xowagadopelokimupiwat.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/lajubekifenot.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba4001024---pokodebatesek.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bogikow.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/23783399253.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/29246406589.pdfIn PDF document text
    • http://hasyo.net/files/file/45523235928.pdfIn PDF document text
    • https://totounited.com/contents/files/94031307072.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/letumateguteva.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/buribogibasazejelezisinup.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/17771084026.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/56361558391.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/wupigozekitijitifewedet.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/bubudazujizipidudafoza.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/binaruroralivenewifusag.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/16102949336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mp3+converter+for+tubemate+apkPDF 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_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 17092 bytes
SHA-256: 5f4cff16a89cee62f7893f30054c7282e101a6a0234214a8371a96f77447b3eb
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 10900 bytes
SHA-256: bbeb85292e9d0ae143b90de01883d5d3b35e50073a62550be219887839577a1d
font_02_sfnt_off000119fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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