Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde63858b5d92724…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 19:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb16ccb7e9537f156fdfd84a8953e7ff SHA-1: 0739062b8103ede7f856de206de635b051cc0276 SHA-256: fde63858b5d927249a86733137f19351de48801152e141bda5ca415ce3865db7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=custom+rom+santoni PDF link annotation
    • http://splhardware.com/UploadFile/file/2021090208494073499.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/laredibejobasutazobeman.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b2393c4e7ce4eeec1d9c723292646c72/fajezufesakemipover.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/ridanatolujojatiju.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/92021275647.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/61135060690.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/88213875346.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4c42bbe32990e49c0b61ad6df53e989b/55495199611.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/12677155333.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/24640731897.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/36166062195.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/mewuralurugawu.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/28550049294.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/bakukilemikorogebul.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210908181707.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bukuzixiworupetasobif.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/xowikom.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/948524226.pdfIn PDF document text
    • http://thongthien.vn/upload/files/kibasopijukerapopagenuvud.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/726957475.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/nusanedujupopobojudolefu.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/17665860270.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/fakunegifevigovorolovaje.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_off0000b404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 17088 bytes
SHA-256: 79efa3291a025ddc152fe8b15f87afa704b74bb2e412b6eec5bd5a9d0e980295
font_02_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 10224 bytes
SHA-256: 8d3f4aeb88819a15a2419ddeda91ba881194114a6fbbf73de20beafcb499c668