Malicious PDF — malware analysis report

Static analysis result for SHA-256 1676aa64a7b77cee…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 04:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2ca39b7f17138ec1c2f49aeb6194bcf SHA-1: 2adcff6428caf0f74cae014f7b8f0986d30bada1 SHA-256: 1676aa64a7b77cee42533d53ab8c8e90b534ec872e574bc356c332011924c855
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=influence+the+psychology+of+persuasion+free+pdf PDF link annotation
    • https://trystsalonri.com/images/file/68386158956.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/lusananunofes.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/47280243428.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/juzetamivuzubuludetewijek.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/piruw.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/tuzipazub.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/70555587400.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/55727236258.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/59043268587.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210907_D65B27AAB4660084.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/kerefumidodikejomoma.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/21991010153.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/958323936.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/ruxepekax.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb021cd79b---42755869285.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/lakatit.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/6943950570.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/28686678944.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/80321647338.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/66533911034.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/18594547962.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909015646_aywcf2.pdfIn PDF document text
    • https://lesura.net/userfiles/file/81530133376.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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 18876 bytes
SHA-256: 918345c9deba7e3b3ea18205e73af1355c826081a32f530218ce4f301a1ce4bf
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 11064 bytes
SHA-256: f3153a670e75d47bad71d8e96113f1477d703d4045a046df2d3c67724c4a103e

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