Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3daae250a8280bb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 06:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 418ee39a2f7692686ad2c2a480fa6ab5 SHA-1: 1118f71d43eec2236b98e09df6a4f8fee215dbdd SHA-256: e3daae250a8280bb7dbbff0d833be7728829e161b137854aee09508a586f9191
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious content, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://www.sensiblemachines.com/ckfinder/core/connector/php/files/xakojofo.pdf In PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/vufepi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/83788971822.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/tesotulovexijifudesemowub.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/ruvupirelugozosewovepasej.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tevodizidadiwe.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/punapixanojerig.pdfIn PDF document text
    • http://adice-area.com/pictures/files/51333346673.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161369c77562d9---mujavijidexo.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/sudabopupola.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/95237223382.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/83346843182.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/53914588574.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/41931171917.pdfIn PDF document text
    • http://julianina.de/upload/file/gofor.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/83075283267.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/37198688833.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/pubozuvuvared.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/mawuwefonikatenefosavo.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/74281002450.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/52929525754.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/dovofatuzasidetele.pdfIn PDF document text
    • http://amkchem.com/upload/files/40390869133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dream+2017+apkPDF 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_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 10220 bytes
SHA-256: b44d3fd8cd2492fb4daa253fc2b4d099da26f604801fdb39c2f17f78cb6a2296
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 18904 bytes
SHA-256: 3568e5e5652b67abd50966ab7f4633b05973ec6b2aaac5f3764c24d7e0b69641

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