Malicious PDF — malware analysis report

Static analysis result for SHA-256 e940c4618d92fdf4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 23:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c7bf9d3c30a3a5f27c60a2c6cf05459 SHA-1: 3e2284e9e026456899af6326ddf6ce84a52586ac SHA-256: e940c4618d92fdf41bd9422833e0675a276f4f4d8894be50822ec4f5173721d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+to+soft+reset+your+phone PDF link annotation
    • https://museuminiaturesbesalu.com/files/95839575192.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/53239230373.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/wadorogijegodi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/59893902807.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/mejivigemasu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/43343182037.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/17151756503.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jipaxu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dofenadeta.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/wubuvogajufugemor.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/94349279393.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/pavivivud.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/jomozufimimeb.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/gomej.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/pipukavaguteduwaka.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/sunorewonekelanatuxiboles.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/loles.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45320316411.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/zaguloni.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/21545056364.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913022302194.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/27632551205.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613db7f5d2f71---gubenamosokum.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/31207817751.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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 18368 bytes
SHA-256: e2411bc76021cdd85d4354ba504ec9231b4b579b40d0db371d2f9a17934c021f
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 10444 bytes
SHA-256: 0d841c56215f90f65e980d3425cdbfedea4070dccd91b52f04c3a89791368838
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1