Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a19430c6b77878…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 12:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4ccedb0e2d3c54e829996f38e3e6a04 SHA-1: 6df02943662cc2655c2e1525d15b5e0e972239bc SHA-256: 13a19430c6b778785b815dcf1f08659148289ddc4bd5d31f7a41041fed06e1c8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://newgrids.com/userfiles/file/11803788719.pdf In PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/mutil.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29278217706.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/38009385927.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/novajafebisuf.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/94626380769.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/guxetoju.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tifalotuj.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/55568514877.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fomifagubowifekivuxugisiz.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/64451303361.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tozoratelipiramodegar.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/wowifaloduziro.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gaxexezif.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jomosipawulufifigowoxasep.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/32668396641.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/16611190507.pdfIn PDF document text
    • https://geloracinta.com/contents/files/munarupoxusevuwewovopax.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/72011774548.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbee5f904---2614527264.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/tejegu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/sorozajaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=music+juices+mp4+download+mp3PDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 11036 bytes
SHA-256: f3183365144f343461e815473e9287eb1a8fa1cd0db3269aa85171060dfb105d
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 18260 bytes
SHA-256: 8266856c3c24f4b8c847f75e3ce93f7e2a21131e30455d68fc4f76eeeeda4eab
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1