Malicious PDF — malware analysis report

Static analysis result for SHA-256 29aa70a06e854ee6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 21:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d25822fcaec72f0d64260b7e324e398f SHA-1: b1f0de880d8201def01a1eb9a45c53c5eb09bb63 SHA-256: 29aa70a06e854ee672094b5e49f3d7db0feb2d90b899d784c8f6601673e43b24
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to unknown domains, and a heuristic identified it as a link farm. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://eric-parnes.shortex.com/ckfinder/userfiles/files/lapatenomu.pdf In PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/42802316192.pdfIn PDF document text
    • http://snft.ro/media/file/19209770847.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/bafaterela.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/buvogusiwipumenud.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/nedazugokorevese.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/63368142822.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/85323212436.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/telakasofawaxosepuzejag.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/nigawewixiw.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/50534401966.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/butujizo.pdfIn PDF document text
    • https://camphacement.vn/upload/files/34678125063.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/8016307918.pdfIn PDF document text
    • https://domilot.com/uploader/files/leromamebidusis.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f6eba5e37eb4b66d4a7030750846ce42/dofisupogegobifekumexejaw.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/mojiwaxavivozudomerawila.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/93633219495.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/15230371901.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/95748422129.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614100e180d13---fanetanisawuzetino.pdfIn PDF document text
    • https://netlandschool.cl/files/xiporuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wireless+display+on+android+phonePDF 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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 17548 bytes
SHA-256: 56a9fc6196706b916c41c876e3f006c7093751ec7579f64fd9f4ac7ceee42dd6
font_01_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 10496 bytes
SHA-256: 4a23b98735db61545e74f6ac771525ba8e4d082881641656b3f33e6ff2db1170
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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