Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eee6d5b0c9e4697…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 01:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d120ab56dfef9c01e5ca83818b64778e SHA-1: 82eb0a3c1a721e79e48c2f7ef42913611942b4cd SHA-256: 7eee6d5b0c9e469728c3b845a0a4bedb96f47b3d6ce555dffdc468d46eb84848
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to suspicious PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pioneerlift.com/upfiles/editor/files/lirolaguxakonibow.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9049cf7a---nijoso.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/kajebuzupij.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/95019956982.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/25429084048.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xufijonime.pdfIn PDF document text
    • http://bluebossa.pl/files/file/fitipe.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/32307295949.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kovemozorariw.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/goretaso.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/mexipax.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/kuwalukapivosawisag.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/4302206322.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/87503940555.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/bedujap.pdfIn PDF document text
    • https://ptogel2.com/contents/files/dafonig.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/60624557916.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a699fd9.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/towuvotidemopuninalibuvu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/sizemagazolenumakarutulu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/votururipovaxerutixeminef.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/23912570034.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/88899388941.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/10467035011.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fuvinazipewefit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=c+programming+for+beginners+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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 10868 bytes
SHA-256: 0d191f5e091388dd0b4fe8ac9bd6fa79d563111d336e34536ac569c880bf7da9
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 17792 bytes
SHA-256: b168b5611fc97d7b95db0b15c0c958919b1fbc87fb9a5e2ba062256cc9ce4c96