Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62f8538c8ded84d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 19:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 208a929043e699f383f56eecd8009069 SHA-1: 043d7ac8122a7749cf4406638bf6e2a5dbc11d2a SHA-256: b62f8538c8ded84de87ab2e374525d5efa73e5a72d00d967c0e04ddc181bc775
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain, likely serving as a lure for phishing or malware delivery. The PDF's structure and the presence of multiple links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=bmx+2+hack+download PDF link annotation
    • https://yptea.com/data/fckeditor/files/pibamojipukajiwozat.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210906_135246.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/42493821426.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/lezerapele.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/20818343838.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/wofuz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f145020e0---gavejakonasumajomami.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/figupexuxerovarovaxuvit.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65477104662.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021912336465000.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/6894326711.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/8999750960.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/mudorofivolikozuxuwesiv.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/fotekukavaxas.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021913_41631_682.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/77644642157.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xezujovalonobixujizib.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/jujorenepozumaripewefarow.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16146f3a6f249c---jodojumudaworekunipovide.pdfIn PDF document text
    • http://rurisnet.org/images/file/16968576698.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/dukemaxamujamo.pdfIn PDF document text
    • http://mgrima.com/files/file/sipuved.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vuxawegofidanixonowad.pdfIn PDF document text
    • http://btfa.tw/upload/files/12873701003.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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 10496 bytes
SHA-256: eb8c71bb3ef82a0f374c915bdef5748694da929f8a1c69733979b38875b1a215
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 17272 bytes
SHA-256: 85e09e7741e43ec5ebd157fe127e83875c3c64c0de8b54ea2160114cf543d722
font_02_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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