Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fe8c329af41e6b…

MALICIOUS

PDF

84.1 KB Created: 2021-10-23 03:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 036197c3913e6cc76e49fecc9e6fca26 SHA-1: b3748bd04ef6c4fb3f1325c8579b91f7449b467f SHA-256: 79fe8c329af41e6b237f2d1a3921e2d5febccd536dc411e62a37f4d3fbb50fd8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fujiya-la.com/uploads/files/zevibegiwekisofunijakoron.pdf In PDF document text
    • http://abwrosedale.com/uploads/files/80965741949.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/49226486726.pdfIn PDF document text
    • http://cosyromania.com/media/file/54929254494.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/xapekusotuvamorazepaf.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/pazezazalu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/jogokadekevogakedavoza.pdfIn PDF document text
    • https://htchninc.com/d/files/65569838435.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/kutunikudokugilowol.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/terodifijodaduxuwo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16161944731f3b---kuvomelogixajawagulowovi.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/lofixitudapuxatil.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/50976631541.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/52767504296.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/rubarapulaw.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/38919456718.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58854961147.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/27639943716.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/61654261969.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/gefelidegupalajigaxowerot.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vukanadiziwidewopotel.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/87795542448.pdfIn PDF document text
    • https://laser123.com/geektic/files/28070686700.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/30196953610.pdfIn PDF document text
    • https://aedwea.com/upload/foto/najomivewar.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0929955d---91442510765.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=the+sun+salutes+you+questions+and+answersPDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10756 bytes
SHA-256: 924f60c953a0b28ed500998a8ab62c1240df5acc818dc2fda56b6011c3e22fef
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 18332 bytes
SHA-256: c481cadbee504b9dfc0d480e96a1f08847a548ac223205b910dc76008a1c0b5a