Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3d6bbd019d6c17…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 10:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87efb6ceb808f101a21d3a248d2951f9 SHA-1: 437b3a165bc627e4c6d4479965872a0e252df9fc SHA-256: 8a3d6bbd019d6c17c2a9d91a1b73ffc5e5acbf4b370012a125e18f1a26279522
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=it+was+just+like+a+song+when+we+were+young PDF link annotation
    • http://gocoachfox.com/userfiles/file/jegorijizegekesukefelube.pdfIn PDF document text
    • http://potlista.com/file/files/pokevepupijokixudekowim.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/derukekudabapolit.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/90532679839.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xaxufitex.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/99115937037.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zijewegipovepav.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613359a8038f5---68403850547.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210914050903_mpyuuu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f530b4fc---netiwusinenar.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/3609537237.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/64124975276.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/32972027345.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/32130792005.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/74520180511.pdfIn PDF document text
    • http://net-work.cz/data/file/fojeman.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/75454499839.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/91163074362.pdfIn PDF document text
    • http://wajl.net/img/file/20219411255.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/bironuvuzesumejelamuso.pdfIn PDF document text
    • http://laserinnsbruck.com/static/54571734095.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/76056177426.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/46971890138.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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 10860 bytes
SHA-256: 47f4b6f35c615eb760673e1c27af5a341c5fac2c1612a5dbdd4ed26461d7a3e6
font_02_sfnt_off0001321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321B 18576 bytes
SHA-256: 14b128fa5215e8c41a49ecd23b94074d5686ec411c37ad4bc90d7ac3679f9d7d

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