Malicious PDF — malware analysis report

Static analysis result for SHA-256 01306c7c6666f4fc…

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 05:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ca4a884b14ddbf27ce4c155a5c61a0a SHA-1: 7f0c7c0216df0842411c080a0b1168959e1d3872 SHA-256: 01306c7c6666f4fc94a2333650e3df4900ee0b01910de4c885660bbe2bfcce12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous external URIs, many pointing to disposable domains, suggests an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly imply a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lodoshosting.com/calisma2/files/uploads/mimog.pdf In PDF document text
    • http://www.gesas.it/media/mailinglist/file/dugewizovuz.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/82947749897.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/somivoditijisiferi.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/deginaporop.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/66492282232.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614637d8bec33---2945605697.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c121c8164---813168107.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bufadapuxuzigavik.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/46811591808.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/ropete.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/83398683225.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/ligusaburakigixe.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/29052672537.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/60352567619.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613513ad80b10.pdfIn PDF document text
    • http://simoncaulkin.com/images/geredalozodof.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/wovirejubolefixiwos.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nigonotelumirawewab.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/83421064917.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/74047584587.pdfIn PDF document text
    • http://spbi.cz/res/file/wuresajanirujigijuku.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/93811613353.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/94647311565.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/vutasupuribagulikijoxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sbi+card+android+appPDF 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_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10280 bytes
SHA-256: 22b0b283e2b319d73bb5bf54946a82ceee2b25ea235154103b780fc3f00d641b
font_01_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 17656 bytes
SHA-256: d74920bbaa18cdecb04a846e5eaadfe6c3b34a8a45ed04375cb3feedd34e3cb3
font_02_sfnt_off000143ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1