Malicious PDF — malware analysis report

Static analysis result for SHA-256 42940c640d82c0f2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 21:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ef8e796ea75e8e40b4b34fd6706cc47f SHA-1: f532af6d78060398b58bfc1ea0a5f0d510f6e7e6 SHA-256: 42940c640d82c0f242306ffbf0af4c69515e0c75b833dc1d81493b37a99bc45b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The embedded URLs and the ClamAV detection (Pdf.Phishing.Trojan) strongly suggest a phishing or malware distribution campaign. The document body is heavily obfuscated and likely contains embedded JavaScript or other scripting elements to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=android+automatic+date+and+time+programmatically PDF link annotation
    • https://birutelorasin.com/contents/files/24728752665.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/51302909483.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/30377087349.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/27724647719.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/piwozavegemupasi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/66315601612.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kerebavowevugojiw.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/dopumaxevemugapus.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/21600436473.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/78944657445.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/81391856192.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/33703964873.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kuzagidolofesa.pdfIn PDF document text
    • https://mlspoland.co/files/file/zabuxuwogezejale.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/36474636499.pdfIn PDF document text
    • http://wawa757.com/uploads/files/wuwiru.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/dagususabof.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/96178240489.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/suniwuvoduniduzib.pdfIn PDF document text
    • http://gr-chem.com/upload/files/37733891483.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/74107315859.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/85235825985.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/96306391695.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8675945984fa2b2d40ea372112ce948b/tonis.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63531439908.pdfIn PDF document text
    • http://chongros.com/userData/board/file/45978487206.pdfIn PDF document text
    • 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 16972 bytes
SHA-256: ef4f348408156a2afa593907af13e524fe5569c63b3e20cde91bf27bdde696d1
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 10884 bytes
SHA-256: d8aede473f1562cb7e3a27c5d4f3d78930266d7acb8cd5264398cad116490f7d
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1