Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5498d2e2a60ffff…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 10:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7fe4563590cf562c14316219e50bab6 SHA-1: 4398e9b4932d16bd889ab0b6a83a2ef6b1bd16bd SHA-256: e5498d2e2a60ffff49c747c62ecd8748107efc13fa2930f63e46e8ad21cdff71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious or disposable domains. While no scripts were directly extracted, the PDF structure and the presence of many embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kolkatanagariksammelan.org/ckfinder/userfiles/files/51487832087.pdf In PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/20195670594.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/42368129965.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/bawebubivatedimox.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/bigesefukefur.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/xibedasujarelogewejafo.pdfIn PDF document text
    • http://micruts.org/userfiles/file/84063158843.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/83290994951.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109250611389504.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b16e163b047178fd6c6f577acbc70628/3689300627.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021991249159121.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/lipudit.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/noliwugotofowefagagu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/11919929476.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/92621773868.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/pavusewugi.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/20978457162.pdfIn PDF document text
    • https://digireg.cn/upload/51604356015.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615179f444c3f---61786906364.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/18892711107.pdfIn PDF document text
    • http://chenruichem.com/upload/files/fijijonefop.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/24863291139.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/tebubomokaxibunisaxi.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/88194997510.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/91781906393.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pudadarusorad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wear+os+mp3+playerPDF link annotation
    • 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_off0000b53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53F 17480 bytes
SHA-256: 68ae7fbfcedd0c83e8c9da9e27f10ce9aa950699da40bc99f3599ff72495e34c
font_01_sfnt_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 10396 bytes
SHA-256: bf64fc4f5e2e24dc238f9758394c4f6c0dcd96f8786206947134e50b989f345d