Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c5d11582abf71b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 14:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b45f00357f353dad8811a95dd51a96be SHA-1: 700f4160fc270711687b914b0e8befda5a2e3e3a SHA-256: f2c5d11582abf71bca12ecf160d514536ff096bf3e65c871b1e4f57884d1df8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=osterwalder+y+pigneur+pdf PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d591b495b1---3437503077.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/67409143288.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/goxeluvef.pdfIn PDF document text
    • http://isgsrl.it/images/file/78669895805.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/33264281688.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/67785481954.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/toxelavezivozanilavur.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/maloriwu.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/82247909534.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/43407029585.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135035ed7c6e---67423322892.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/pajegagijutikine.pdfIn PDF document text
    • https://uangraja.com/contents/files/xupob.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/68614868558.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xaratatutupozepalijal.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/gilem.pdfIn PDF document text
    • http://capri.lt/userfiles/files/kuxogexufekirevefikaw.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/newamenewixativowomis.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/gorikinijosugetogeso.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/kabitojorigug.pdfIn PDF document text
    • http://broadcasthub.com/ci/userfiles/files/99063521108.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/51792726536.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/35948035295.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_off0000c2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A6 10880 bytes
SHA-256: 098dfffb08d04f94bb90f20b6f7cd5d93f3b24d9c4ba3e3d73811d1325762e3c
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 18388 bytes
SHA-256: 25d55180fa5cfe2dadba2e10f224d51678ec1d50f62e541e12009b0f26839302

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