Malicious PDF — malware analysis report

Static analysis result for SHA-256 f845e4cd10c38998…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f223688b28850406ac8dd950696b8c0f SHA-1: 66109f4fade8191a963ee90f1e0ea377e7e44838 SHA-256: f845e4cd10c38998b1de88730971b73391c84ccd1f7d2d5124e39efee354af89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm on disposable hosting, with numerous URLs pointing to PDF files, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mofrantech.com/userfiles/file/21898141349.pdf In PDF document text
    • http://hzbaoyan.com/images/upload/File/55341679406.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090621482073499.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vunafiwitimapoliz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091520474819.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/44672135124.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354aaa75350---91589847290.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ada8161d---54160471530.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/lufaresigivokom.pdfIn PDF document text
    • http://klenderbio.com/upload/files/3269373175.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/7331590640.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/xakajirixuw.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/kimomuma.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/negosufakapekizobil.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/82123552673.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/94307076532.pdfIn PDF document text
    • https://satesayap.com/contents/files/kekabipuwikewovotivodaw.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/45540510169.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/16950738224.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/kasiru.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/denimiba.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/dasipabuko.pdfIn PDF document text
    • http://medica-brno.com/files/83218653801.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dakuxerajav.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/49919983120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nova+legacy+unlimited+money+apkPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 17780 bytes
SHA-256: 2793397bdb8a61ae073f956492dd2cafdf490e117e1e8d5605ccdc7d2b789dcd
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 10936 bytes
SHA-256: d3d6912599946f78f944b4093c9c126e6c50f1f6b5e751ad55af693cffc7b1d7