Malicious PDF — malware analysis report

Static analysis result for SHA-256 0375301e29a0f6a5…

MALICIOUS

PDF

92.8 KB Created: 2021-09-18 01:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 915ebbdd79efe91677ad4f77dc284f24 SHA-1: 074d29a986adc59128f9be167196a17701138bd1 SHA-256: 0375301e29a0f6a550cf95976be1f9793dae99efe5f02def4afcb396f172a986
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=opencv+with+python+by+example+pdf+download PDF link annotation
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/lidozolatuvotanat.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/77334756598.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/lawigi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/70426662698.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/sabakivirizaxawuteledib.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/meguzipatov.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5deaa155---rodux.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/fiveruletuvelaferofut.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/tamedelajamojek.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vujekame.pdfIn PDF document text
    • http://dytac.hk/userfiles/28061457224.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/el4g8o9kacdjhnh92sop2t7sp9/ravetatabubog.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/96149206962.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/jotexetusuxizawe.pdfIn PDF document text
    • http://kelvista.lt/images/files/79682876364.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/xaxidigubofebavo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/2558631333.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/80232042208.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gexubozenelixoj.pdfIn PDF document text
    • http://thevalleytrader.com/files/gabosefe.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/17455533305.pdfIn PDF document text
    • 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_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 18764 bytes
SHA-256: 089a7502bad6b6e943514993a9343f52d89e8822e888ef2fc5d04b06ee6c48dc
font_01_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF3 11148 bytes
SHA-256: 089fab60b212f7b880f9ddbbe7e672c2e3a808d718f1dad4d3fc3cdc6f52878c

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