Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0eed1e0ad6e367…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 22:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4d5dad2413c349f4618f6de2cfbd3a7 SHA-1: 72bc8c42a6530d953245908debe95bccdc0fc17b SHA-256: 0f0eed1e0ad6e3670aeba3c1b074f09d816bdb3e76be7b50bbd21ab26947bd86
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, strongly suggesting a malicious intent. The ML classifier also flagged it with high confidence. The primary URL, https://coretry.ru/uplcv, appears to be a redirector, likely leading to a phishing page or malware download.

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 https://coretry.ru/uplcv?utm_term=breath+of+the+wild+how+to+get+money PDF link annotation
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/78507906733.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/pevam.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904221115_lsc5gs.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/71129419181.pdfIn PDF document text
    • http://generoussecurity.com/uploads/56438086294.pdfIn PDF document text
    • https://blgjad.com/upload/files/68372498140.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11020761847.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/nunujorat.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/49214269669.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/nugugaseb.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/dilokeveberibipuw.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420c693e0b8---82580258127.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/kuvowebep.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bexexagojabovemibalotad.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/raxipitulibivolu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kadupibunulisixekededagaf.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614f938095f1c---mozatabujuluraxakotode.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/78022484381.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/42582420221.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/jinawupitibin.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/1857009064.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/dilawod.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_off0000ad66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 10888 bytes
SHA-256: 9e21f4993a95b5b57ab8584c62221f52e52e134e46756c9455b35456976c2dae
font_01_sfnt_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 14788 bytes
SHA-256: 721691f37899d785fd8cc671254af64e64af6a12abdf9cd386a69c29e9910ec6
font_02_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1