Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a00b73f81d2dd1…

MALICIOUS

PDF

74.4 KB Created: 2021-10-03 14:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f44a121e45a37cf2f73c8bce4b0491ce SHA-1: 15df54637f72cfea16db9ee102434f7f95249b8c SHA-256: e9a00b73f81d2dd1155b82ff1c4cfcb6b9f15b662a1e16401c983c15ece6cfdd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic suggest the document's purpose is to redirect users to potentially malicious websites, likely for phishing or further payload delivery.

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 https://philabc.ru/uplcv?utm_term=valentine%27s+day+bible+quotes PDF link annotation
    • https://copperscraphandlers.com/ckfinder/userfiles/files/bunenufapudip.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450080ace67---nalipurorowilavuz.pdfIn PDF document text
    • http://canadanur.com/resimler/files/kewateb.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/vesowuvajilenuloju.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/57340075453.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141353b88d0a---76914894661.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/9864434647.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/810260651.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/25650578237.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/puduka.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/pigatixuluvufin.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/zabobi.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/tugewobixoji.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/wulufanixebatido.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/vowujiludupodasosa.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/39222354405.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/96531229968.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210909184618.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/73207897963.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/59419147553.pdfIn PDF document text
    • https://resicolor.com/upload/files/3747321238.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/44537597013.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/sapopup.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_off0000bb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 10644 bytes
SHA-256: 08f3a103b98c78278d06af7ce29e395fb83239f869677baed042c7cde7774df1
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 18876 bytes
SHA-256: 49900d2411a7e80ed1d4bae6d57480b86d0044173ce5e506cd72eef9991b124c