Malicious PDF — malware analysis report

Static analysis result for SHA-256 023c6e7b9b23bc2f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 02:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06ebcf004a92203e23ef95612908630c SHA-1: 4b4f0f3357ca646e7417eb968af34e8a0abcac72 SHA-256: 023c6e7b9b23bc2f9363a97cc163ffa8715d3d4e8ed91203342d209259c6482e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also includes a link farm with numerous URLs, many of which are hosted on potentially disposable domains, suggesting an attempt to obscure the final destination or evade detection. The presence of embedded JavaScript and external links indicates an intent to execute malicious code or lead the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://songhongresort.com/img/files/31360700091.pdf In PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bitikegotibadov.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/38394096825.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/rixugivuzexi.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/miluwevesuwakajukerip.pdfIn PDF document text
    • http://teraval.cz/res/file/2917499204.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/nuzupatozewofagat.pdfIn PDF document text
    • https://micsys.in/userfiles/file/gekolamigeputukivobu.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/zipadewega.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/29933380.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/91922732765.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/83429602090.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/zujem.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091929342528.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/23213136761.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/7016729371.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109070330552766.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/74235508019.pdfIn PDF document text
    • https://0900107678.com/upload/file/navumefimip.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/71496285479.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/38181517127.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/1735858683.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/zinufuwidosujodas.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/80968347793.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/84367565184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+pdf+free+downloadPDF 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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 18008 bytes
SHA-256: 763a7468c89d949ac4dce10a9fd791e55ac1377e374446a7ce9f997f40726943
font_01_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 10420 bytes
SHA-256: b14d00960714efe6a8cf064a3b8ae12d3c99903e55242c44f31018bb647db04f
font_02_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1