Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7363bf69a69000b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 16:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1dfaa7c1468da0400105255edca983dd SHA-1: dd897ab3a612a389ae9e3ec362d51b4f1881bb5a SHA-256: b7363bf69a69000b83ebeb628be7dc8e9d665804200905a70b163cb929a3f359
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed a link farm structure with numerous embedded URLs, many pointing to potentially malicious domains. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://namhunglogistic.vn/site/files/40927947559.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0239fbd7---48650487035.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/mugenadapepobu.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/93016619402.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_054938.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/42373424063.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/terolodepiravi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/nifedovukipujumog.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/26884930690.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jepadujagibizumugogupofir.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gupumanakekezaxuji.pdfIn PDF document text
    • https://parfumzone.ro/files/file/mixatebara.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/60997091147.pdfIn PDF document text
    • http://xhzhengli.com/upload/40547589190.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/30927658109.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/47320100956.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/88789373884.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7c41bdb4aabf35945539504120276e4a/zubib.pdfIn PDF document text
    • http://santeh.md/img/files/tokirogagenajibu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/87059727481.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/zejuzibufaf.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909234531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+to+excel+free+softwarePDF 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_off0000bc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 16664 bytes
SHA-256: 993fad87e721771241a2b636da14fd65e4f59f2e491b13fe90700141ee9a644a
font_02_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 10808 bytes
SHA-256: c8227f6e0c1e4742ce755e2977649194ef21e426f250102df8061b0af1189f26