Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f591bf5d10ccc9…

MALICIOUS

PDF

73.3 KB Created: 2021-10-03 15:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 004338bb85b5a07fd47ea89da0e65bb3 SHA-1: 0715068fd7525effd7152df58bbe825f9d28f364 SHA-256: 41f591bf5d10ccc9cfe84c8588e4867de9ab829530bb72522e7f633614bb97ee
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs and a raw IP address link, indicating a phishing or malware distribution attempt. The PDF structure itself is also noted as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=best+way+to+clean+army+boots PDF link annotation
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/51657181396.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/xituwewawosuj.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16155dd9be0a63---fenesakekubuvedaw.pdfPDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171b73cdc0---tonomiga.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/seliko.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/nowolizavobaxi.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/71284290285.pdfIn PDF document text
    • https://nexapos.com/upload/files/kesiwejiza.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109191406032387.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/98829909983.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bebefikupuv.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/8466926755.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/senakeniro.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210906224509.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/67770462325.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed589ea643---34096708339.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/zuwinuxemozasa.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/45436783590.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/kejesabunowuzadix.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/lixez.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/28848685451.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_off0000b696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB696 10692 bytes
SHA-256: 8562fb9a5bccea24b73bbc3884579e7f584b8f6568d96cfd24bd05f06ac68c5c
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 18964 bytes
SHA-256: 19a4cd8cc02a85eb24cdd226f72e39d2d539879f11c76376204eaa43fb6b087d
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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