Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7618c649cfd75a1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 08:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4c8a8914da1ba5b1668f6ffa8caf0f5 SHA-1: 6e88741917b66f61c5c5b06f0378fabb02af96d6 SHA-256: f7618c649cfd75a1db693994417bb0ecb23a7e49a5d7522ca2e46525ea467de2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vietsaovang.com/uploads/userfiles/file/jeboromizesexunikutipi.pdf In PDF document text
    • http://d2dgroup.net/upload/files/wexaponapiruzobo.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31366471510.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/72387636183.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/69886815346.pdfIn PDF document text
    • https://shidoremicrosys.com/media/80633515170.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/39459932740.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/venagexipitoxoniwet.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132842f5c239---vorirex.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/newolakanixafi.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/mepenazisenidaf.pdfIn PDF document text
    • http://boki.hu/editor_up/nitetejewe.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/19704335837.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/82628939079.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/37926824293.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/vigefok.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/datakidurase.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/ravutupodu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/44621381340.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/metalugojusibotutinuja.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/54633432230.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nitilabipoxelodasuxesi.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/25402968062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cute+houses+in+bloxburgPDF 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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10600 bytes
SHA-256: 92927beca6db32fe340e1005ee2aeb2fc9abcd7e87f29d0ca22976d83bf285d0
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 18128 bytes
SHA-256: 308811cab55932b9d4634aadffa0e20e1b67daf7a9cd2b545ab3e8e4d580ba8b

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