Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb869c3cee17b69…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 20:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358ddf8881267f271813e6401db0b48c SHA-1: 7d301bd65c65255879b8d944bdab0b0af1fc3f47 SHA-256: bcb869c3cee17b69264554a84f48dbd28d6511c87cef8d00d3ac4a88bd5e3f5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studyhalltracker.com/files/file/43846327378.pdf In PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/nifavivi.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/murafas.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/thav9jricpvffl5ja7evhm09r0/38617875117.pdfIn PDF document text
    • https://solturism.ro/images/file/nevenoti.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/30694760614.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/25116989287.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/76209511364.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/80134539294.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/bumojawogamomegofo.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/xosilerukozaziruvaxexewo.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tuzejaxekevirotamapibesa.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dbc7c0d1---26696544275.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/mumupikesasafawuxe.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/3844466704.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/36644760826.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/39758480993.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/14294683820.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/jegubitizi.pdfIn PDF document text
    • http://zgic.ru/!upload/files/jaxobuzitidufif.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/18275920201.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/39490336295.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/91449769647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hecatoncheires+god+of+warPDF 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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 10784 bytes
SHA-256: 5a9cf166f9161f7e8f8184a75c21d51f21f00458890b86473e5ccb8bc3f2e8e0
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 17796 bytes
SHA-256: e67ea18068f940db4bd0d96a78750349d9822a634ab9062aed50320498a0758e
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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