Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8c521781e3e55c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 14:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d54b0c5c2dfa2c1c177acaae2a3b936b SHA-1: f78de7bd9c5a8433813bf2354de749e923d0c832 SHA-256: 6c8c521781e3e55cc5b0f3768062b5be80104452df1b91e3f01e8f98703ce62d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=how+to+change+the+phone+font+style PDF link annotation
    • http://mtreurope.com/ckfinder/userfiles/files/76271623785.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/23063960102.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/18120818898.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/soxofiletivinujuxeleduj.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/26915203827.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jibodewevorijix.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/818505818.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/76209091217.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/85668704913.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/xokajovogetitogijamemo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135192203ba9---32647866111.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/ruvimelowibeta.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/68005345806.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/68872890969.pdfIn PDF document text
    • https://shibbirs.com/media/files/66028903924.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/7204532639.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xejalid.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/42293533308.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363db6785b9---mupaneril.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/51580570354.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17524 bytes
SHA-256: a7d6ac2c5d0bbf0f014db891c7e702f6d9500ecc4f04bdf3c4289d4deaa3fe66
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10756 bytes
SHA-256: eedd22f7cc6f2ff721f6cf242af17c001e3f9e0614410c2bf261f8ad941473d9
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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