Malicious PDF — malware analysis report

Static analysis result for SHA-256 362531c21c225b2b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 09:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d811b267a914f5bb232fb36e5546fc81 SHA-1: d1cf4daad10121e6e002d8bd5ba8ec3501b1fbf6 SHA-256: 362531c21c225b2bbfba51b21c98a0ae64e852d455932c5b7f376786d47da38c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=screenshot+settings+android PDF link annotation
    • https://riosemarescentrodemergulho.com/ckfinder/files/16004922861.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9ccodkm3rqir5plicu5l9g9qkm/25686506130.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/54178491262.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/86264725194.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/73418943399.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/12703166932.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/81076970605.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kodojivuna.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_256FF8042B80C654.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/monuxe.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/kabofexadijes.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///golanimoziki.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/64345337485.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/josojatusenorogofeseji.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/jalurejademet.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/49250693664.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/52632448410.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/gafuzesotabukuve.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/midemuwi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/kefetowefesefapadukexolij.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/guxez.pdfIn PDF document text
    • 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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 17672 bytes
SHA-256: 9f203b2d4c0bc4fbcba85809ea9a3e3245c1a08f91654c4f559a102b84e5fc3a
font_02_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 10676 bytes
SHA-256: 247cb3cf2ae7a5f48f8141c6a49dce35e7693f290bf8c934031b67d664113375

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