Malicious PDF — malware analysis report

Static analysis result for SHA-256 0255ca2973bf8c52…

MALICIOUS

PDF

90.6 KB Created: 2021-09-14 09:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1daea1985a2e733c47b0832309845ef SHA-1: e8d12a6e5b6cc61d03f175094921f93eca2f3ad6 SHA-256: 0255ca2973bf8c5207d72f0bfa49fef14a342fd06d94ccfa4133d17ceede4a53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=minecraft+apk+nether+update PDF link annotation
    • http://ebslang.net/_UploadFile/Images/file/22518779499.pdfIn PDF document text
    • http://519pf.com/userfiles/files/feveg.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/4204513145.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/96437042940.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/1684860060.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/forusilusabo.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/97273125960.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/18448279958.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/jazijomoxuladaxexotalop.pdfIn PDF document text
    • https://kristinanamaste.eu/files/motugesotanugixabemasaju.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/fazadopu.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/lawevazimutezejoxed.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/25618200769.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb66ab1a57---47265031840.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/64318316060.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/44132536343.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/nugazako.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6f299775ed5e75a655e83d6f3b0c26a7/gufalejo.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/zinovunimopaxiba.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ladamidosimesemilibevi.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210902_044521.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_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 17860 bytes
SHA-256: 860162d042dbedf1f662f67cf1da41a3aa9605b96c1557f0f66fd037a8cd4339
font_02_sfnt_off00014572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14572 10568 bytes
SHA-256: d99c2909fbb97deb028eb7c25d3c00f95aa1d1d0308aaf4c69a99582465ed55e

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