Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea4ea0745921f5e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 11:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c06afafe39b3e1d5101066a5635c984 SHA-1: 6fd453f86b29a3389dcf48d6cefc8e1b4dbfdb45 SHA-256: aea4ea0745921f5e58336b999ecca84d45e5e9e6f839af1c220f02467f0138e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a suspected phishing lure for 'word 365 sign in'. The ML classifier and ClamAV detection strongly indicate malicious intent. The file likely serves as a phishing lure, attempting to trick users into visiting a compromised site to steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=word+365+sign+in PDF link annotation
    • https://ratco-hardware.com/Ups/files/pefod.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/83961376202.pdfIn PDF document text
    • http://odumakus.com/uploads/files/94137197401.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/76376426856.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613267fcd98f7---mitifu.pdfIn PDF document text
    • http://esen.life/userfiles/file/92571301603.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/92715795846.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/pokulojokovexiletuwupor.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/titujazudosivori.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/94726146636.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/73443762707.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/tuworudi.pdfIn PDF document text
    • http://cochemical.com/upload/files/luzisawirox.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/zevetutebuxolosirivugizoj.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/72555121556.pdfIn PDF document text
    • https://megashina24.ru/files/files/90653670736.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/vefiwilugizefateno.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/10427246493.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lokuvogimejalazojijigoxon.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407fdc85592---gozasarazago.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/73647039559.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zomaf.pdfIn PDF document text
    • https://izr.fr/files/loradudiwob.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_off0000cbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 10452 bytes
SHA-256: 6cfcbadee39c9847fcec28ce351bc581da7a60c40a619d493090a6a1a1456826
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 18916 bytes
SHA-256: ac925eaef01b3f13ca327ae6700bcc8543a67e300365f7411a91f065cbc96074
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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