Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea3f2c9d9a88185…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 20:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 423dd963e85c53905c053d00b2b269c3 SHA-1: 5ded2d2d6ec57d34e608fd0b8959c14510a09ecf SHA-256: 9ea3f2c9d9a88185b56c21601dc1480a3931aaba48181b5ee84fde211c3f294f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a common tactic of redirecting users to malicious sites.

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 http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67629115564.pdf In PDF document text
    • http://nova-auto.com/upload/10712679605.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93bd0871d---wuropofow.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/janomodunulewolaf.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/pugigexoluzalex.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/64056303756.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/vesumugexila.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/39450754999.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/kawuloxukeladaxijiwoza.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/45009136190.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/86526094030.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161345f0d27db0---78962050386.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/42273854622.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/jivitinasalog.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/48682383217.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/losatiku.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/rimonapusuxalexo.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/83526978672.pdfIn PDF document text
    • https://keongracun.org/contents/files/88422442316.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/vimumowuraxose.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/85086303817.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/rulukawowinapalopig.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/48894840304.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/2571696315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+network+layer+and+transport+layerPDF 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_off0000b6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C9 11048 bytes
SHA-256: 81b4a3b3a6a8e3feed2a5abcc5af753c2052c1d5bcf019928a83661ab204a5bd
font_01_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 14732 bytes
SHA-256: 688fccd8a9035fe54391f02b56edb04dbea1c88052fcdaacd314a44c34cd4ddf