Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa9da4a7b7fb302…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 13:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccaeb5621488ad7d141fac3bfcea4002 SHA-1: b4470f0fcb4dd97328cdcc7bca5e2ff5787c4e57 SHA-256: eaa9da4a7b7fb302d7e8998716347927625d05a48b5a6717b8c9663d0cca6657
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to other PDF files, many hosted on disposable domains, suggesting a link farm designed to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://equimat-cheval.fr/file/sifabilavuxavob.pdf In PDF document text
    • https://ekransamara.ru/files/5171942259.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zavoteboxe.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/29879314722.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sizizolirosafe.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/nugib.pdfIn PDF document text
    • http://tavio.su/files/file/zipapivawamekud.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/zubosokakudoxofovim.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147316d60fc1---74094803323.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/pukik.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613638c27ebcb---jerefamanematakogixezepi.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/juxobetumelunis.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/nurunigeguzepijun.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vatelujobogetibu.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/78476158723.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/25380645148.pdfIn PDF document text
    • http://newworldss.com/uploads/file/wixuvafiwegizovezap.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/xaredavekiza.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/54317016825.pdfIn PDF document text
    • http://planetamama.ru/files/file/8445678258.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/31302257366.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/nobijumexap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+11+in+redmi+note+8+proPDF 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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 10420 bytes
SHA-256: f01f8e64cc69140759ba9e642b4415933fd059a91bb1fa2dea72207c88d57343
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 18568 bytes
SHA-256: dd89b757cc6574e0727d5cdc590590ad626ee9b121808dda28562ec57a429625