Malicious PDF — malware analysis report

Static analysis result for SHA-256 df02eb3469aa8379…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 19:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 01a4199ad9792a57e9ba2b89c2911c2f SHA-1: 3241b7f080ba32b325a49cedf077d7efb7b3d09c SHA-256: df02eb3469aa83799e9c352d72075376b22c906f71f195544bae8ae5d3194c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=telegram+chat+android PDF link annotation
    • http://safiorida.dk/operatori/userfiles/file/67278960649.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/jamekusolexexudu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/navavefinojunilemizu.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xiloladisevuw.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/93318041122.pdfIn PDF document text
    • http://e-sheremet.com/img/falavokususirepafobepinak.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/wuzeve.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/kejew.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vesopefopitoxese.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f720f54421---kipebosotawomesoxaloxed.pdfIn PDF document text
    • http://hibertek.com/image/files/20210915_232828.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///vogebafi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f580ab567e7a3ea6daf361181b5d0f5f/71300001610.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fiwikurixozinelivaposabe.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vunob.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/54544329182.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/tuwenirasesa.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vopanusimojudaxozidojunaw.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/13958451795.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/rupatikamunojiwidukirez.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/38042183995.pdfIn PDF document text
    • https://armenia4d.com/contents/files/sevakulomafogukama.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210906070738_261025166.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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 10612 bytes
SHA-256: 391dc69351cdfb793e19d8e88007a4bf29dad5d6196e9bd46bd81a63b8edba45
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 18160 bytes
SHA-256: 31bf6ce9d25437445bed427da06c9c7b78bba529e6ea8437cedee4b3627d9784
font_02_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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