Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd570565df79a890…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 20:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3211c76bd1d10c07a1349cb122421f2 SHA-1: 2d9089fe579bd9f686f6279d753592ece2e81c8a SHA-256: cd570565df79a890611d6137e23858a15717e1c79705edcc9266489ef9ba3c9a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=hudson+foreign+policy+analysis+pdf PDF link annotation
    • http://dietetyka-24.pl/images/files/vidokeg.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ruzunafil.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/99373905829.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/wudubunoxiduzamidipuga.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pededegesalozojilekevuz.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/sotopulosef.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/7074308271.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/27923551198.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/11072149859.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/mojubebogininigevaro.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/97309701672.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/29749865247.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/volol.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wewozimituxikomo.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/68222943579.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/20126797236.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99111943214.pdfIn PDF document text
    • http://preiss.at/upload_files/files/41127049918.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/jowemeziworajuvedadile.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/16923967197.pdfIn PDF document text
    • http://portableandcool.com/files/files/xixizodumevobokerolopari.pdfIn PDF document text
    • https://majubesar.net/contents/files/20982261766.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/51444535304.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/43798389451.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/10048961597.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_off0000bd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD20 16896 bytes
SHA-256: 4fef6c466a744ad6d5a57196de37a0b602cea65ffa1cd865e849e67ed2543e83
font_01_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10904 bytes
SHA-256: eb7b5abc5c1a11844f0dc13a249439b26bf09c3c08bf108a92ab3a296b06fd4d
font_02_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1