Malicious PDF — malware analysis report

Static analysis result for SHA-256 568c4cbaa7ee24ae…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 23:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8521b0205634b21eaade44783c661e8b SHA-1: 01c78d3ba6fdf2f6e5b2c2775c20a888a2e32a99 SHA-256: 568c4cbaa7ee24ae38056fc48d89f17db5e24397d295c2a00eb3dcff3f361cb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of many external URIs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mywayrtk.org/userfiles/file/woxajifobebiv.pdf In PDF document text
    • http://tryinvest.eu/userfiles/files/83659140333.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/80977972463.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/tujosebitekobotogata.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/54903342159.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/51741551024.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/53421629086.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nilazotowesiwag.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/xuzawalaketoxus.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/dogexiluzidujivoveg.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zunop.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/pobusadeluzutapo.pdfIn PDF document text
    • https://produse-zilan.ro/files/79948684125.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/zigedogaz.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zinukeru.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/35403925254.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/89684880333.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/752845644613b9bb8d2ed8.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/40756554053.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/98421991831.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/loxopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=filipino+movies+torrenting+sitesPDF 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_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 17256 bytes
SHA-256: f2e2a47837c1e6c4c339830c61f63589a43e89abcab4dc3896fea4069b5bcdcc
font_02_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10476 bytes
SHA-256: c77d1fe1ef1b3bfdc21cfcb6ab274dc307c83efe809ffd4952963e6ade2e7935

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