Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58ce8dc44c23ec4…

MALICIOUS

PDF

80.6 KB Created: 2021-10-16 01:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97974af5afb10982b2f19d653c2b6871 SHA-1: 40bf500d536d389760441f667dbc125abf4ff800 SHA-256: e58ce8dc44c23ec49a50d5f13a58c7aa056ff7df7a3f6c773827012b568beb9a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it's a password-protected archive lure. The PDF contains numerous links to external PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://healhumanity.foundation/userfiles/file/70896432561.pdf In PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/14807612592.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1633409981.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/lutaluvimilogokab.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/mumagopesaj.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/90708041716.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/18444495634.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/suzomegineriteladunobuga.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/kanafi.pdfIn PDF document text
    • http://forti.in/userfiles/file/pozaxoluwina.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/14395130596.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/83744326265.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gekefukevafi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/visosugomoxanuvezi.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/99388571606.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/lumimitoziw.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xibitad.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/84573843395.pdfIn PDF document text
    • http://newo.ru/files/files/vewutaxugomeg.pdfIn PDF document text
    • http://agro-partner.com/Image/files/ravadizog.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/33803925356.pdfIn PDF document text
    • https://costarica4d.com/contents/files/navigimemuri.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/78349694161.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/8148858532.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0966160d0---81425420088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=export+highlighted+text+in+a+pdfPDF 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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 10692 bytes
SHA-256: d28ccdaf4a7511c88706ec0bd9614ae1244877906917626fccfe53004c731444
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 18144 bytes
SHA-256: d94338b138e4e9c2e3e2791061e7bbab38092c29fbdb06c4123cac3f8b9a8280