Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9838bc063b36112…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 19:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfda84e63497e5493fafa95f823fb7bd SHA-1: bb4bd35cab9b20b934209418845a4e7b3e03c534 SHA-256: e9838bc063b36112a0d3577681f4e324a1823b2e72889763412ec9bb665235dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests a phishing or credential harvesting attempt, or the delivery of a secondary payload. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further indicates a potential link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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
  • 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 https://irlanc.ru/uplcv?utm_term=turn+off+wifi+networks+available+notification+android PDF link annotation
    • https://baongochoa.com/upload/file/ratuxifavotejaxite.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/29057266026.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/53369121909.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/32138841730.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/samajaluzer.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613849201501a---28797994533.pdfIn PDF document text
    • http://melvin.cz/data/muxaduzo.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/71269893967.pdfIn PDF document text
    • http://nemochem.cn/upload/files/tizuduxofo.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/43310689124.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/3621339355.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/kipinuvilijofelowonujeso.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912102014.pdfIn PDF document text
    • http://heizler.hu/files/file/xatipidegorofaj.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/tukulewizojatiwejix.pdfIn PDF document text
    • http://stringladies.cz/userfiles/4217966891.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/45230941824.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/larikukebutosudumuta.pdfIn PDF document text
    • https://plasy.com/uploads/file/vulorag.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/33548813745.pdfIn PDF document text
    • https://buyafranchise.org/files/files/19778031335.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/87257657516.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630691581.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/5324633696.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/27790135558.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/47834712929.pdfIn PDF document text
    • 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 17624 bytes
SHA-256: aed739529c56430d05a77c485924308a4b56db5859e1e22dd003d9c8fb0f5cd1
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 10916 bytes
SHA-256: 33de3b2215e17894c3bb3acd79855e9ab77fec6535604f355e16b171c4c343e8