Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb83e53253f6b92a…

MALICIOUS

PDF

85.2 KB Created: 2021-10-10 16:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: d2429c8aef12d0811640e82e828801ed SHA-1: f5e10ac40913a2a317a4e3fe16aa660b1803d9ec SHA-256: fb83e53253f6b92a733b23b0ed01cbba67231daa75601ff1a432996e8c9ac8b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, which is characteristic of phishing or link-farming schemes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hankilfood.com/upfile/files/gexeziwexogivozo.pdf In PDF document text
    • http://yugreat.com/filespath/files/20210904233544.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/33817190731.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/62472786318.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/50387373209.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afe1be0912b7d87307c983afd75d04f5/77208450077.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/tapuxiguvizuku.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/95752052846.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/40748362839.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/17102066203.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/58572005078.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/71377550050.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/mizilenenipik.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020018245637.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/50095052712.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161590bfc00ebc---wekozexo.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/lobujat.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/15759274438.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/muroro.pdfIn PDF document text
    • https://e-midas.ro/files/file/25337501806.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/80264921856.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/kuxajij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=back+home+in+indianaPDF link annotation
    • 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_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 10368 bytes
SHA-256: 791b7eba0f438e3c6809a2ea6ebf2cb97c2be26c45d2b0a916861a9fffa8b609
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 20604 bytes
SHA-256: 49b413b55401a3f201bb5868774f9cbd45b2c82c763d1859b0d7539a37fd2128
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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