Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc81110cb14a8b3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 15:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9e9a397a188a8ba58317d1c8b2e4467 SHA-1: f7d3615ba666a2986360850c785a5f2550546073 SHA-256: dfc81110cb14a8b375e4194c793ed6626e3fdcecdeaa952ae5233497e26fd0d5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest this PDF is part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=i+hate+u+meaning+in+telugu PDF link annotation
    • https://khachsan295doson.vn/namthuan/images/news/files/zutiwuj.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/lufuxusafezogodal.pdfIn PDF document text
    • https://beaszemin.com/files/mefebaz.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/larofifulagajofaxa.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zefadofuweke.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/7673694895.pdfIn PDF document text
    • http://blnk.eu/userfiles/files/46516582760.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/23436502086.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sebivetatafikaxifapodatam.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/puzabutifeto.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/17102066203.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/83829993649.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rurelaloxavomut.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/xabolaviselibizowex.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/22535541336.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/ganimo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d2aca116---lorur.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sasudowiwiwojarijabus.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70864044227.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/59259644394.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/33278470805.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/2088302597.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/13972579125.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/65155507989.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_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 20900 bytes
SHA-256: c89d57c39ceaed75d13a90a3a0c67892a3880c5cdbe84096c7c0d17d9bc6fa2c
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 10216 bytes
SHA-256: dacb1adfbcbeb7d8eb2e4557e84bc285fb2b33bef28d0b8e2cbbf311d5699abb
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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