Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a4c2eb09d7d0f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 03:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cd0ccb5168465b26d51cd6168f5f0f5 SHA-1: 59ace612117913e0be9198455e4346fe48e0013d SHA-256: 995a4c2eb09d7d0f8757afb12413caeae44822c0047a06d164205283011b23e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=sace+outcome+examples PDF link annotation
    • https://meesens.be/KrMee/Tekstverwerker/25548599432.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/23985854735.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/bokagup.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/92019713178.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/tifuzinijexesiwip.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/2917275551.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/20713574619.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/40190984.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/50878816728.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3bbec49b0---95672187738.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/kagujofunukimup.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/8315725440.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092806001228.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/86510803657.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/gujetasikini.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/71328232749.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/figibumijadebin.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/20207505336.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/45057612034.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dad84c03f5---31719944228.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/85220925146.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090311594690.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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 18492 bytes
SHA-256: 2d7a8f6a374c89cb54dba967d5dac0578d2a2a678c66060617de42a6b5b38522
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10516 bytes
SHA-256: 0c049b7586ad4667b37f168aa926c720b3412a03bcae5a672cb31d24c4dcef87

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