Malicious PDF — malware analysis report

Static analysis result for SHA-256 6977ca3c32574c50…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 00:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8826512cd369147a395523633e343dbe SHA-1: f58d4907244988c333310a7d0a6fd674695c44e7 SHA-256: 6977ca3c32574c50deee8d0832bfb48d7d6aaffc021eb7cea915c716054cd0cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm and multiple unknown URLs points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://tuzvedo.hu/elemek/file/31485452700.pdf In PDF document text
    • http://hide-bo.com/img/tmp/file/xufipukino.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/jaluke.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/bemizolevasejalizevuwulu.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/48777102733.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/38940126252.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/53800891467.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/35995145117.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/sotokuw.pdfIn PDF document text
    • https://onecre.com/images/content/files/96406985088.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/bujupedaxus.pdfIn PDF document text
    • http://jucal.es/images/file/wafurozezenesuzedizoje.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/11030132432.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3c3f5041e---pagatumezeja.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/97529136519.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/21696821426.pdfIn PDF document text
    • http://3m18.com/images/editor/files/dojobuzarureto.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/duteso.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/66825959985.pdfIn PDF document text
    • https://masteranalog.com/userfiles/file/52060726712.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/56983085296.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/kuxumenenotivowa.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/gomewurakalowuzonowazer.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revodiligegib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tokyo+ghoul+1+pdfPDF 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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 10244 bytes
SHA-256: 664a4ed3ea8effe6085bb8de255aa6f0e659b4b2d6930acde3ec7b01902eda00
font_02_sfnt_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 15952 bytes
SHA-256: 31357b3813eb07b8575da00073166fef9dfd141b9e8322bef23fb7d887b60c98

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