Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d527ff0bdf2e28…

MALICIOUS

PDF

89.5 KB Created: 2021-09-20 10:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dba64a455c55e49e7dbda7a51ffe336f SHA-1: 2ac54c79951003407a1de01ebc71f01681036aad SHA-256: 80d527ff0bdf2e28dcf3175dd90f435e0052a4a1b19df9e78da7193722553767
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://coretry.ru/uplcv?utm_term=best+music+editing+app+for+android PDF link annotation
    • http://shuimotongyuan.com/userfiles/file/70716427601.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/xaraborozum.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210905102707.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/3433972195.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/96133424172.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/bogudawagimegevixipeb.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorutesimi.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/jaburomapejiji.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/54305981942.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed108725cd---joverejudibud.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/61196186494.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905131309.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tunajorogezutuniletefad.pdfIn PDF document text
    • http://grimastone.ru/files/molubolivut.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/10677057055.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/pelagum.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/maluzumejutupulofo.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/dizapaku.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/76992986395.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/75641016697.pdfIn PDF document text
    • https://vientangluc.com/upload/files/6629424418.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/38214421571.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_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 17628 bytes
SHA-256: 67bbb5ca623c2c6e703cb98ef1d6ef168a2ebb7cd41391e158b6d1aa78b3b702
font_01_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 11072 bytes
SHA-256: 4ef8dc04d6fb719bf15825fb5dcafc2ffe678dc6a1766a788d4bdb5805434271
font_02_sfnt_off00014070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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