Malicious PDF — malware analysis report

Static analysis result for SHA-256 adca075d16308f01…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 10:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ccc37614496e6ac133c0d99668198f1 SHA-1: ec7b8bfb27ff85cde680e59c71fdf758d7d5bd58 SHA-256: adca075d16308f0187c7e6b5629ee85526385b09df406bd0811202b1e85d2610
134 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous embedded URLs, many pointing to disposable hosting, suggests a phishing or social engineering attack aimed at tricking users into downloading further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of a link farm on disposable hosting, reinforcing the malicious nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tcsm62.org/uploads/news/file/43052209453.pdf In PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/pepulemukexuluvati.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wipoponodelukexegedopu.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/lajanukixepazaguj.pdfIn PDF document text
    • https://network-italia.com/file/68055774943.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/16789543608.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210906050156.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/gikikaf.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zelitabipasapemiwum.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/56652768253.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/10907862983.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/jipemevuseripedinebo.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/relasotiw.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909200941.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/23496680142.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/levuzokeba.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jibevilarijik.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/77580764108.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/56618099233.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c37a93302---rujemegod.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/gomarorivinuvutuno.pdfIn PDF document text
    • http://aprt1day.ru/file/pisogota.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/96303975858.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/6599794331.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/11483439845.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/16741948647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+babumoshai+bandookbaaz+full+moviePDF 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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10968 bytes
SHA-256: 75d30e1da585c43510d36fe5a05daf8b20960031550b2074c09739ee60d282ea
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 17484 bytes
SHA-256: bad007f40a7055330f1672932facf96e197eb71197495e6a908f8c629bd5e1f4