Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cb9231d7629177…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 00:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 790179608db0cc96a54045cbfc8a8259 SHA-1: fdce934465abe67c86038287023dcf9b0d090752 SHA-256: 14cb9231d76291770cbf882981a43651905831172f3a33ba0924f62502532e1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, often used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=live+stream+mundine+fight PDF link annotation
    • http://healthywithhart.com/res/file/ritubilapofawomenobu.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/zoxiwibeke.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/77342370140.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/tovuputimelujenumus.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/82048478114.pdfIn PDF document text
    • http://cochemical.com/upload/files/xojeremixepavodagulu.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/suwuw.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/44687564026.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/bazaf.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/danixujunanutekutap.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/43635057352.pdfIn PDF document text
    • http://ruresept.ru/files/file/94298917993.pdfIn PDF document text
    • https://kultmotor.hu/images/files/wowuwise.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/sifezuxenozi.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210924152056158.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/pifutitozimibivup.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/xejukakiwixukovaret.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/lomes.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/52157576760.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16131f2e443505---43175601636.pdfIn PDF document text
    • https://ferropula.hr/files/raduzemerinajasi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/36059906863.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67379460239.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/vajowawikinufewuwarevo.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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 17036 bytes
SHA-256: 9d8c52ee5847e94ddf99c96a67d5fa75b831579d7ba701857d44f3850eeac96f
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10756 bytes
SHA-256: 2445b2d2d3293b1db416de2a3947ea1d84f2d7731ee1615054684e76070ba582

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