Malicious PDF — malware analysis report

Static analysis result for SHA-256 365a7b2a76e2827d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 07:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6fc488a2aada3e32fa832aecfc5e7e7 SHA-1: f0374c7736e6bb74275258c86ad0f5db6c1b214d SHA-256: 365a7b2a76e2827d80f60160857b6ae03e7c44a275d0247b88b2bc0bfb43548b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic indicating it's a password-protected archive lure, suggesting the document's purpose is to trick users into downloading a password-protected file. The presence of numerous external links, many pointing to PDF files on disposable domains, further supports a phishing or malware distribution attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://onlinecommerce.bg/uploads/pages/files/47291698441.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16142abec76c31---wevunejese.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/27131841137.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/66600497002.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/71505865605.pdfIn PDF document text
    • http://lecostationery.com/files/file/49511664607.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/fipavexorokalirejamu.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/84493645482.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jupevaroduzek.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903044355.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/seninilapogopebaxataro.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/7895938113.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/70992499080.pdfIn PDF document text
    • http://atya.eu/files/file/liduliredez.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/10574414905.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/26202568636.pdfIn PDF document text
    • http://strandedtattoo.info/file/dokavenibelubikidazetinis.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/47424152810.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/dewaxiletudu.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906000316506.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/86712117058.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210910214425.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc9d954e8a---wafasededime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+room+gomoviesPDF 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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 10176 bytes
SHA-256: 2bd5b7578e1b093183a6dfd571cafe4d8f68e006a8d575993ce72035eb003baa
font_01_sfnt_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 15148 bytes
SHA-256: 8449d7ce93cbc5442c07fd90406ec20b9761b58dd95732e0d41e7296933d9d3e

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