Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55dab60367cf689…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6718ad72d25a424494e705f8825dcc3b SHA-1: 1a95b8cc79bd241202950433695a75edf87e5ac0 SHA-256: c55dab60367cf6893a98746140049e86b631c42e9b245e79c807de8b7f4aeedc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to PDF files on various domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bacninhonline.com/webroot/img/files/gexexopikoregesidafoka.pdf
    • https://advantagelic.com/singhania/downloads/file/xegukekegejulobali.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146285b7f370---bunagusafubin.pdf
    • http://kaithompson.com/userfiles/file/77355705520.pdf
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/38636632087.pdf
    • http://sccsfz.org/upload/2021-09/59271238143.pdf
    • http://corporatiegids.nl/uploads/files/kekekigarujog.pdf
    • http://vom-ragnaroek.de/uploads/file/xubezipejufula.pdf
    • http://mikomisushiwc.com/uploads/files/zitesadu.pdf
    • http://evo-models.com/uploads/userfiles/files/27251403862.pdf
    • http://lamekatus.com/uploads/ckeditor/files/43963484866.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/nonomofifimobijosajo.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210927_00CF302EC8DAADE1.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/9676018975.pdf
    • http://dichvugiayphep.biz/upload/ck/files/defoxatepelejeri.pdf
    • http://nceed.kr/pds/userfiles/files/jujosepaxik.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/26732495041.pdf
    • https://masukpt2.com/contents/files/lizoretubu.pdf
    • https://cottingham-group.com/cufiles/files/39113807852.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614731c9c15f0---41645224263.pdf
    • https://cornwallstaffagency.com/userfiles/file/vesoroninituwawet.pdf
    • http://goldmustang.ru/files/files/xasixabi.pdf
    • https://easypayindia.in/userfiles/file/lalirikedev.pdf
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/tivonezenawofegoxurus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mods+de+friday+night+funkin+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b180.bin
a7b70a021b8e29792aed003631d81133a462b9a51192343c612e966885320883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 17244 bytes
font_01_sfnt_off0000dc5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
font_02_sfnt_off0000f476.bin
2bc7311d53ff93f7643b1ba6ad49b3d29daca0723931d8a90742bb0a90c43767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 11028 bytes

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