Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcadf7f40dab918…

MALICIOUS

PDF

93.8 KB Created: 2021-09-21 09:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd14d259c2355938f0c33a816304a4b1 SHA-1: ef276006cac2bed6647bdfe53f30d2717e18394c SHA-256: 8fcadf7f40dab9187ad13e8ee259db23b17e7d44e8a437c0764c9516ab212526
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://globalcenterhotels.com/bot/ckfinder/uf/files/92677726089.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/81729201644.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/87368825220.pdfIn PDF document text
    • https://fasaac.org/temp/files/62570636791.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/65184351928.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95869925811.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/2443746356.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lipafudada.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/wedani.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/58799894838.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31861082799.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614449994c888---sizusono.pdfIn PDF document text
    • http://nincity.de/inline/file/gijarukorepekezef.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/mosekizivabirezegesixu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vawazukusotowixerej.pdfIn PDF document text
    • https://schmitz.cz/res/file/rejideduxewuni.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/nunonobi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cefe91edc0a6a1aa98312c7c560e369b/46221740582.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/pawaloriduk.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/44765906143.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/37553937921.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wofoz.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/17660406213.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/84421402691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i9300i+imei+repairPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 24328 bytes
SHA-256: af8c3574f148e4727307a9bee8ac7541f57227b7a9125da240720b5e96cb05a6
font_02_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 10292 bytes
SHA-256: 5c25442e6ba3d9c312d9c3db65191109fe691940d4876aef1d4680c154212435
font_03_sfnt_off0001504e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504E 16648 bytes
SHA-256: 1038eda53c34713e05b47a8959652d6a868bfb2f196c284ebbb48cf530095178