Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6f25d1cd59014d…

MALICIOUS

PDF

75.9 KB Created: 2021-10-08 21:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 282dd4f0b27db33190b54daa889798b7 SHA-1: 5d7e8ba5d289833dae4ae8b00cc411fc292b5b43 SHA-256: ff6f25d1cd59014d07baf419d7bc8ffbb2cecda20d3e8fc07b4d813b41cd9e49
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the linked content. No scripts were extracted, but the presence of many external links suggests a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=theories+of+employee+productivity+pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/60620094187.pdf
    • https://regionalhealthprogramsww.com/images/file/18156626805.pdf
    • https://agatanorek.com/files/file/62862255868.pdf
    • http://agavietnam.com/img/files/99538744769.pdf
    • https://securitydm.com/slicice/file/73876431142.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/kesarotijidalitevini.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/14621356227.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/11424401272.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16153875182171---77341663446.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xalisebujiginulo.pdf
    • http://guide-eq.com/userfiles/file/20211006235849_krrbkk.pdf
    • http://orosweb.hu/userfiles/file/sidineninapadomipupabez.pdf
    • https://edubox.mn/uploads/users/0/files/45472883601.pdf
    • http://ivankotov.ru/img/lib/file/tuvole.pdf
    • https://webmenuplus.com/images/file/funovetuta.pdf
    • https://rzfmuhasebe.com/userfiles/file/92956307601.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0e75c3678---89552235744.pdf
    • https://mgc.to/sites/web/upload/files/105204689.pdf
    • https://mobilaide.com/upload/editor/file/pomojegowoxekuji.pdf
    • https://marathonlaval.com/userfiles/files/54771455672.pdf
    • http://bettaletroom.com/file_media/file_image/file/95989516076.pdf
    • http://dieterheich.de/images/uploads/file/86346292284.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a7.bin
5e78dc92f8383598b6569da3698339917f08adfe9f209c9ccaf6be35b62b3aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 16608 bytes
font_01_sfnt_off0000f07b.bin
dec81c6938fd74921c17cc6405c6be9dae7178c8f6b2938aa06642894fbaebde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 10860 bytes
font_02_sfnt_off000109a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16792 bytes

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