Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec25ebdfadfba44e…

MALICIOUS

PDF

62.3 KB Created: 2021-10-04 04:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4dae2d8f5cfe84826f8484bc53c829b SHA-1: 0be3b3af707b2ac4f2860c953e22ec76d041d506 SHA-256: ec25ebdfadfba44ec29dec3fe4b90c1f2e4fb7283d04d7b692547692f2f3f8e4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and contains numerous embedded URLs, many of which point to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to manipulate search engine rankings or distribute malware. No scripts were extracted, but the presence of many links to potentially malicious PDFs indicates a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4242

Heuristics 4

  • 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
  • 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://tichdiem.surecare.vn/uploads/userfiles/file/34669718059.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615598535a63a---97003863082.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/36495731769.pdfIn PDF document text
    • http://schokofontaenen.de/idata/fomunepowepatumewuvaze.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/66219386718.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/19808993102.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/guvaloxilagazezotolod.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/95773265955.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/48175581691.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/pudifoluwapufulo.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/budeguzefijanag.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/63733396695.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091916104619.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210921145010.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/27239807529.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/kisigorapemipudezofazoto.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/gonixubedifukagisaxidaso.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/xusoledogag.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/47950675377.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/xekazogutitiraletozere.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/magikuji.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/nopepi.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/50128975880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+compile+c%2B%2B+with+gccPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 10364 bytes
SHA-256: 492b9b0be978cf291f61ab27fb67b0efd8980bc7422d1b909f3ae73d38222a49
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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