Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfacab57a7b1ce33…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 06:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d6b3c20b16bf0b1cca9a7addd9cb6e7 SHA-1: 76edbe606dacf9c554ce213254a914345f516115 SHA-256: dfacab57a7b1ce33497dfe51018bce1e911468c3e7216823b03e5cc2440176e1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, many pointing to potentially disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to direct the user to malicious or deceptive content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://www.sas.edu.mn/ckfinder/userfiles/files/25785846761.pdf In PDF document text
    • http://tokyoto.pl/UserFiles/file/30782684362.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/38067120956.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/puporotifekexulor.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/49058906884.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/fogeko.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/jisuzanosinuwujakeminu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/23e3856dc7f787dd9e391dcf90b520bd/62173286209.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_138022471EA1F390.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bofubibepivisivepozifop.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/waworufaralalu.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/19150865731.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/vufenoneduwodidutikule.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a580bb85---tesawezoguxon.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/80419060675.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/lobozasijub.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/30188602708.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/tujukanavukidosuzeja.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/piximuwisasapakozuzudo.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/babojabo.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/vugiletufimebu.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/94004828282.pdfIn PDF document text
    • https://ratodua.com/contents/files/68582813530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vinnaithandi+varuvaya+songs+download+mp4PDF 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_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 11120 bytes
SHA-256: 09885a1b6ac5cc881fcd4372f01e87906d121a534806875966e3f8d7e4255388
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 17568 bytes
SHA-256: e17f59d879c576117b98e2036be2280a9b8973a87526580171cb2edb218ecafc
font_02_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1