Malicious PDF — malware analysis report

Static analysis result for SHA-256 c634d9cf8d3735b0…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 03:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29482fa6a7c73be69f83f65a5934079b SHA-1: 73016cf719cacc24bea7e53e47ccbebd080c6a86 SHA-256: c634d9cf8d3735b00a3af946de660f01094d7664d8184c43afcdbcfa42b32eaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://biolabsrl.org/userfiles/files/ketebemomeropage.pdf In PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/polutu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xexogejasixerur.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/58215512700.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/60390001249.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/22825651538.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/31097765464.pdfIn PDF document text
    • http://oilspecchem.com/files/bijaxutika.pdfIn PDF document text
    • http://live-net.it/file/67249195800.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/16099676667.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gagumurawubatazagefade.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/migitabuligovemeruvokixi.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mamalamokuvejobu.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/94559292379.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/87409107248.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/49818124474.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/kekekigarujog.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/fojedusim.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/55914792088.pdfIn PDF document text
    • https://armenia4d.com/contents/files/lisabobabitasufasukexer.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/94563387125.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/18869604739.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/towikofolamovadopozaku.pdfIn PDF document text
    • http://theponghop.com/upload/files/56387652610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ptwoe+bios+androidPDF 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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 10424 bytes
SHA-256: c9ca4da14cf92d8cef14fc184167578ee8b156edd46a259d11a29828d2adcd66
font_02_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 16388 bytes
SHA-256: 30c894b6c3d01610d55b46b083572e3e8871905826f7e2dbc9ae4bb55f0649b3

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