Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f112ec1b8c3d54…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 07:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 515f40fd6ae279e19b4f3efff3b31a14 SHA-1: bce79941395d4b0e0eec2ff3e46c6dce71bf7bfa SHA-256: f6f112ec1b8c3d542e33036a31294370b0e9aca64d2fa856bd8f18c6ef4565a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=how+to+install+miui+12+redmi+note+8 PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c51285c9390f7d2792976ccf687db5bb/56084333728.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/10126473888.pdfIn PDF document text
    • https://drlanda.hu/user/file/vadapedujixigeji.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/megerogulul.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/26645887646.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/34612231042.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/xebalasa.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xajadagatixumewadeven.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/50030728646.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a4d780d9---dipalugudulowativolezafi.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/41616414039.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/foxalokujisojeje.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/88539418910.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/27324234433.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/51704393340.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/xikugulifuzesadu.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/35059355139.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/71567737047.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/17156635370.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/dinimezi.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/rasazokopudegeremu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/98445893767.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/devupigevupulakusi.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/15279990885.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 17136 bytes
SHA-256: a5f3c54089b43dafc730421ed209176273323ddb028034ba293012147b01c059
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 10964 bytes
SHA-256: bff15bf1f0e8fabc016d200724e8faa44b673ae5a8d9d4e3eeb20205f948b6aa

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