Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be9618b2410f89f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce1725e5fc4a5d91f431f286a9e6cfe8 SHA-1: 3093cf1df048535c1a8bdf88abdab99e6e67fe7e SHA-256: 8be9618b2410f89f4bff910824b83e96b7e570997f8c686d0d25528a45a2d5cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to link farms and disposable hosting, indicating a phishing or scamming intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to artificially inflate search engine rankings or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=ranger%27s+apprentice+book+3+pdf PDF link annotation
    • https://dom4m.de/userfiles/files/teteva.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/finapazuvosofepanekifon.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17179430887.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/17264575642.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/konizomunod.pdfIn PDF document text
    • http://change4best.ru/upload/file/65275849745.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/zojufofixamuda.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/siwuwusavagovobowifegogor.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/kagawigakewedalap.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/jetimizogikapumepeloxer.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902082125_790222334.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/47914600864.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138518f19077---6421167025.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/18046227123.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/72518078947.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/63665475552.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/lijexisovifadoxerejipemo.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/22543459432.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3d8708e1c4448d0e25823daf69bf78fa/4709171046.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/gijuledasawotamim.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/jepisanemuzabo.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/50534758694.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 17952 bytes
SHA-256: 4c18471dc7d6f5200146c34d2dbc2e2936161a7d52a71951bf838cd64775c942
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 11232 bytes
SHA-256: ecbaf7d7cb1818a129aa14f1f7fc1af6947bf3171afad58fdd30e88aea55ecef

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