Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d616a9dcdbc46e4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 03:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48851e771a592ebdbdb71655f4e2f301 SHA-1: 7ca4b9104bb107a96aa4b76dff350b5e5c8e5879 SHA-256: 5d616a9dcdbc46e44dfc2f480872885df550b7f00aad0e932425b41cff9732bb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt. No scripts were extracted, but the sheer volume of suspicious links suggests a coordinated effort to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+get+extra+brightness+on+android PDF link annotation
    • https://zapret-rf.org/web/img/podborky/files/tivawiwowupoweguje.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/lelanojosotol.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c25ebf53---pawemegutizivekadegix.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/51497082462.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/zebowibodeteva.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/16797251955.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/32661380340.pdfIn PDF document text
    • http://melvin.cz/data/13221017148.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/86901736053.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/2619220455.pdfIn PDF document text
    • https://samudra99.com/contents/files/6906975802.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/xolujivilodozenatarova.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kivavetepufejeji.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/xenewa.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xulipadake.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f649945c1e---lopijowebisof.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/gidejavikamulawuke.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/motopujuximisebi.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/90051185294.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/fixatama.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/kagenetovadusivodagafati.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/77969663956.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/merifisebo.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109101247502080.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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 17728 bytes
SHA-256: 6e896b37620787a55d8c096c12c94b1b0f8e6ed2575eacadce9c7ba3cd9e4ac4
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10800 bytes
SHA-256: 746bcf714527ecbfdea5d28d0322ec03b18d3bb1f09fd81c5acdb136156cf283
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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