Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a69106bc7c80c1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 11:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c0d40e43c29cd59ad286869184eb5d3 SHA-1: 388727d0938a3c5d8a9b0fb5207d40e161f38fcb SHA-256: c6a69106bc7c80c11cc8beaf011616711899e4963f4b4d871efc586bc0287269
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

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 http://jr.ac.th/ckfinder/userfiles/files/pigemusatemobux.pdf In PDF document text
    • https://travelworld.ro/userfiles/file/28116951762.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/gevuvawixofawi.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/62560983914.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/samujekesisepesanakutor.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/wamap.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sijebasosodudozurepuvif.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wuzojapibiduxefexedepuja.pdfIn PDF document text
    • https://andhimazhai.com/images/files/pufapune.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/juvomugabuxegukebabusireg.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901173104.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa279e7ed---karimurur.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/16393341277.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/lezexetelodivewilifadij.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/37921758998.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/98304015013.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/31554713624.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210919120959_bm6gl4.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/82073655216.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/tepov.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3710d7ee---gogekazebefepasuvomuwer.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/zenopatuzukawedelorobuxuz.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/86231088658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=proxy+list+of+pirate+bayPDF 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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10604 bytes
SHA-256: 8644e8bbd83ebca4cd16942bc0c345b059bff06b66b7ae88aea6f4867325b1b4
font_02_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 17340 bytes
SHA-256: 613fe8cc6c291b9112906c7cefbd3880b7636e5f1e7069da5d6737360efdd118

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