Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e369103a7feb9d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 02:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65ab505fcecec9024e47e97124802e1c SHA-1: 66b2d2649cfd131f51322aa06a7f19f796f1368f SHA-256: 02e369103a7feb9d38ece905446bfd6c4b7d2efaa7dcb34c22ed1f088dd1f48b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The presence of a visual download button suggests a lure to trick users into downloading a secondary payload. The numerous embedded URLs, many pointing to PDF files on potentially disposable domains, reinforce the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nocleginaplus.pl/uploads/userfiles/files/83680669580.pdf In PDF document text
    • http://officeharbor.com/pdtInfo/mirenerivebizopub.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/dakumegizatetefakuninijit.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9da0e2b98---58811945664.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/dijokijoxer.pdfIn PDF document text
    • https://ms01bet.net/contents/files/41822939207.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/redozefeloradig.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/75165634846.pdfIn PDF document text
    • http://www.grifin.sk/files/91949530360.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/86707009829.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/10601679921.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/batimifetavorosarenexotuv.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/96775378299.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/77636466146.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/sazozotemizoduvifeje.pdfIn PDF document text
    • http://ceroki.com/image/files/92141841304.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/71149280289.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/55210225377.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/lateforutuvetulufowuxezig.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091108090473499.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/62075461040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=motivational+ebooks+free+downloadPDF 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_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 17020 bytes
SHA-256: f39f1c52051a33dd2d65258c6e1346a3e88d5765cfe0423f7d9e29d78b7b4da3
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10724 bytes
SHA-256: 2d89b636296a180bcdecafb64293e22fa41472b332825b5e2e9dddcab0e8b3e3
font_02_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1