Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a61db96e14157f9…

MALICIOUS

PDF

95.0 KB Created: 2021-09-06 11:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e79bb5e3441e4b7d8becbe7ba462121c SHA-1: 6b257833702e12e9d8f3b8236e29bddeda3f77f5 SHA-256: 1a61db96e14157f96951d281eae4f4ef4d11de522b11f2276a446436dc5f7744
66 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be disposable or used for hosting potentially malicious files. The ML classifier strongly indicated maliciousness, and the link farm heuristic confirms the suspicious nature of the embedded URLs. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161008cd687bb6---modumukanal.pdf In PDF document text
    • http://ed-web.cz/userfilesfile/36066859245.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c9c4ec5e---5249609437.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/wemotarejafisipalasekob.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19538381142.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/52966787818.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/zokugurof.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/65605686739.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/fipizezuvenivakudixi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161245ddac1628---45119135564.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/59777023158.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c7336bc952fd175b1d7ca99d77582ea7/lagoziniseximaxamowuve.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/31578032821.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/10964917901.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/54164762237.pdfIn PDF document text
    • http://vanhacollection.com/images/files/roxodef.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/wadetugisagetezozi.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/lanolijazupitob.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/jazagapijaw.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f6c51122---dabatatimelavoxixivolojet.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/sokopovabawuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=butterworths+forms+and+precedents+pdfPDF 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_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 10988 bytes
SHA-256: 31e5ff09b8ccd96e7fa2ff93aa16ebc449a6d6dcd0fa13af080ca231e16c7d88
font_01_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 19308 bytes
SHA-256: 2bb7fe0a327a2508f403deaf9fda4104fc1ecc9bac30b9db5f13541621fac8d5
font_02_sfnt_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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