Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d9b1f185db2bc8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 03:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4310be156f2752939676cc95af44c2fc SHA-1: b4850aa31f8bde3dea763c0b0527b97e68af637c SHA-256: 38d9b1f185db2bc80f900dd6e3a3bc4647454cb8d9c554b35fe23d56737b2044
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a significant number pointing to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://rcp-ranstadt.us/files/vatezubifej.pdf In PDF document text
    • http://kenhuffbuilders.com/userfiles/file/79157867925.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/89472365736.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/kotuwuveduwikutitevodar.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f10c31a94---50930996288.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/muwuxapuseba.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06518698---68973879910.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/71573964612.pdfIn PDF document text
    • https://funke.be/data/file/fubitijavexokapejumidet.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/zokukejujigofuvolip.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sumofevisisizeremedaro.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11806338497.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jobixuruwa.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wisakasigupu.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tozixepebejetudane.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/39773960155.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/wufawoxazun.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/92280419384.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/37969794123.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/wukisoduwopozubuvuxa.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/40579483049.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/11065339640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=black+hawk+down+123moviesPDF 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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 11080 bytes
SHA-256: 8a2efdee31140c824d81ba370aab34ee91a8064e42d6f57e660821fc91712176
font_01_sfnt_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 16652 bytes
SHA-256: 54a9aefae5f1275af1ccf741c9a3e9bd85203d20ef80f267aa1524b7c0ce9bcf
font_02_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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