Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c954b31949dcec5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 07:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 16b623a990c05c6c980c311f347d708d SHA-1: 67b6e82b187b2c1e761789316545ef089a395c37 SHA-256: 8c954b31949dcec5315ad5ce69c2d5db1a9e023e4771c357f1c97bc9cb5f69e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://clubesolbra.com/uploads/files/bopozuviwejojo.pdf In PDF document text
    • http://renknh.com/ckupload/files/37247416812.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/riferidimawaduwafezojiju.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/52940161514.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/21134321373.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/84475664609.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/57283602319.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/busukalagemevutexunip.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/pasipikonidezetigerow.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/vinapek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48821544718.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9a774a2b8b766c05c14ac0ba777aef63/65992134207.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/62997857868.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/funamipa.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/zivilukonopapilamo.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/28417233498.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wefuninutafagedixatati.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/746c982bdb67b1efba65dda118086cb0/nenek.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_C84110E515F5D190.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/96957972006.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/delesakupodorafasazatibi.pdfIn PDF document text
    • https://fivetc.net/uploads/files/dusosufesuzirutorafimor.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/96755385883.pdfIn PDF document text
    • http://www.andreapondika.cz/file/74297519952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=standard+form+of+parabola+with+vertex+and+focusPDF 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_off0000afc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC7 11452 bytes
SHA-256: 3cbd8a519b92000eaee8c303d74c93e7a403f21abd193de80aa726c3bd85608c
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 16392 bytes
SHA-256: beb96ac7739144db9c4e8fbc76a050de1a513e21aee9268ceefd997401c1f36d

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