Malicious PDF — malware analysis report

Static analysis result for SHA-256 df684936d13cb478…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 08:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b43afaacd817fe1b75015c7c6c0d36e0 SHA-1: 0260fedd4d0895ed20dac452e835de62d8a61d31 SHA-256: df684936d13cb478cf01cd6d04365128828214c947be1a65d7c951038a878113
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, and the presence of numerous embedded URLs supports a phishing or malware distribution attack pattern. No scripts were extracted, but the structure suggests it's designed to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://air-ned.com/uploads/files/junixux.pdf In PDF document text
    • http://career-id.org/ckfinder/userfiles/files/2297364052.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/paruzis.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/94443367901.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/birepemujuxilep.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/779480119.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/84661330145.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/91459362798.pdfIn PDF document text
    • http://clickvay.com/upload/files/45614115569.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/60143004422.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/25809078015.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/08/97252363249.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/delisajiwewapijupis.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-21-45-43-76.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/44279312554.pdfIn PDF document text
    • http://01host.ru/userfiles/files/86916942761.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/871130e1cd4c1b2fd5a6cd96c6ec9dac/piwememebuwixijogo.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/fefudebus.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60865672350.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/22547093838.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8e2a6q9rps2ii4h8d5j3c1iaf0/jebefe.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/81396155415.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/24024039063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+set+live+wallpaper+iphone+7PDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 18176 bytes
SHA-256: ca38ba216986a0187d73804271c20604d0a88f2ea2681ed59e94fcacc36b150e
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10540 bytes
SHA-256: 3a77b93953feccf1659dbc855da5d76f7943357eaabc6fd54216268b3d3cfe4b
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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