Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c5f09b2a5b3a13…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 00:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb603138d49ac9e1c314f455ec44a137 SHA-1: 9ad85e1edd72801a08b9e918d749d6f865366772 SHA-256: 27c5f09b2a5b3a13e7e4fa2b3d21847e8a847b0bdc3e9368463d6320adcfea06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://kawana.tech/userfiles/file/61155295145.pdf, likely lead to malicious content or phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kawana.tech/userfiles/file/61155295145.pdf In PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091808574627.pdfIn PDF document text
    • https://zzhqhi.com/d/files/varujiseriku.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/96374869217.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f02bc2b76---51849372233.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/muguwi.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vanebesaveta.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/53001883028.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/mutobap.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/7034422292.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/37242595781.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/80983180064.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jisowemez.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/28138370431.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/27098759026.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/ginivefufajigexoxipowuwa.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vozoti.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/93678545791.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/volopo.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigigibisimatizuzopo.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/92562883767.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rujivumopofusawesoleniv.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kewud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+limit+hotspot+data+usage+androidPDF 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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 11016 bytes
SHA-256: 36c36b73ce3de0d3802288590a777d767c165c60abef1464526f93a727a4d823
font_02_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16944 bytes
SHA-256: 1ee0a796434a2be75b2db7d166cee78ae6b2dad4d68e3f768f76c3be7fa2935c

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