Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28678bc2a10e94f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 18:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd9a5a8c137ed9c336e970b7a7f02744 SHA-1: 0fb561c750976a0aa02b796e62e4ecca0f1cb710 SHA-256: a28678bc2a10e94fb700bdd3047bbc2d700295fd91b22bbfda5ca701de0b03c5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic analysis identified it as a link farm on disposable hosting. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://coretry.ru/uplcv?utm_term=assassin%27s+creed+unity+arno%27s+chronicles PDF link annotation
    • http://epmachine.ru/d/files/zumilutetazixekijebu.pdfIn PDF document text
    • http://rsst77.ru/upload/files/23349509593.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/ratezupotoxuwijetut.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/duvanowajibot.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/10503201706.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/62701159708.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/derakexexofodoki.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/43232132953.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/41688809635.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/62181214314.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141641faf0dd---35042037926.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85618154543.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/83265209703.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/magadoxajujariboxipen.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/81538034453.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/5058644307.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/22114259219.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/89171292747.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/18650145879.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/78147267069.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/19635385590.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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 10696 bytes
SHA-256: 3bc6fb1ada880c23d3c4f645b96551db1720ca5887c13c36108556c476653b5c
font_01_sfnt_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 19724 bytes
SHA-256: 71c18923c85bf3636c4f26aa1c6236266e783977cc4a18317690b7887ccac7f1
font_02_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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