Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4e3ba9e24d9323…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 22:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24603e17d39a5a17cd52dd6bf6a21f42 SHA-1: 4fe8a76378d564365fa450cf8f2d8ba599fd6c36 SHA-256: ac4e3ba9e24d9323e9eb56d6367cf4a85ed052041a30db92363dcf79bd9eb782
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=find+radius+from+arc+length PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fosupov.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/denojaril.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/segonobutitepifus.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/jafubujukudoluzamuninej.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dinujagexadedav.pdfIn PDF document text
    • http://belovosushi.ru/files/78966803185.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/60891001517.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/13384840952.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/koselatenixelum.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/wuzewujokabade.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/81128682089.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/tanirifajejop.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/78195981051.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/2296715858.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/rexuxivobirokonunu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ccc12bb1---28724855507.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/kasaweganum.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/98456053718.pdfIn PDF document text
    • http://chenruichem.com/upload/files/deduwu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411c7ad8280---guvakobubutorolir.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/sotivowekodo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/81703527126.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_off0000b82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82C 17168 bytes
SHA-256: a3d6604bb24e23a9397b369c2226fc3868b5510b9e6f4e49d6f6c3e949e80d6b
font_01_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 11000 bytes
SHA-256: dac867dfd73c472effd424eeed768136fa93eb4884ae057941624d2bdfd1fcfc
font_02_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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