Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e63a5af299c4f3b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 07:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a87031089fa0dcb62b8c072adec85ba SHA-1: 1d9f77d8c89f399e6f578c9146e6a642cc6956e0 SHA-256: 9e63a5af299c4f3b807a099f439294d8dcace88854e3b0bddb9a5dd17b292a43
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 high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yer-krasnodar.ru/ckfinder/userfiles/files/18372999382.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/akdalu6fioglhhbppj1inr09mb/23914598363.pdf
    • https://073741256.com/uploads/files/202109071817596404.pdf
    • http://delfosventures.com/userfiles/files/51571649250.pdf
    • http://luckdidea.com/ckfinder/images_store/files/75626841899.pdf
    • http://tourister.kr/userfiles/file/72439764344.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/jimunivafemumi.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/90482099221.pdf
    • https://academiapreprod.riportico.com/userfiles/files/tomatolexamuxusixelewo.pdf
    • https://towa-aaa.jp/userfiles/file/84396960411.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161446862b7caa---kexefilunojoterijoxebap.pdf
    • https://lenaoyunlar.net/calisma2/files/uploads/kugekupudaxojowawof.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/59770181387.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/10568156111.pdf
    • http://samtekelektrik.com/files/59127077698.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57701912851.pdf
    • http://irvine.songhakbbq.com/uploads/files/48556395117.pdf
    • http://evevoyance.fr/adh/.-/file/duvabikalurive.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/menubovafupixelarupejex.pdf
    • http://bagliodeimille.it/userfiles/files/nutuguwidowazul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hide+app+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 16792 bytes
font_01_sfnt_off0000f43c.bin
ce649753c3239920433fcfff9bc992cd651e9b76c4efb9c1067686b7d3cf1a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 18296 bytes
font_02_sfnt_off000123e2.bin
bb0394a35f1bb5c25227560f8d6138cc27ecb5d50567e9a8e64994babb77b347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 10068 bytes

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