Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6fecab5b1a1133…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 12:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 003f1ae3691a879239b7c207829e1e67 SHA-1: 51b0e541159f3cd5bb597edaef4b39e4a535a40e SHA-256: cd6fecab5b1a113354c43d95ce732e2d687517c77891157dfa7225d3d1232c9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or content-scraping campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://coeb.eu/userfiles/files/fifetipinuxitomegofutuk.pdf In PDF document text
    • http://ibconsulting.it/userfiles/files/gurizabakik.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/zeromiviwupozaket.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/nubuxodewebuvabixaja.pdfIn PDF document text
    • http://veitali.com/upload/files/xiwironomapem.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kiwufudaxewukuxu.pdfIn PDF document text
    • http://www.andreapondika.cz/file/76042363478.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/31102730230.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/wuwobiwojogubarewen.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/xokagikupubudodogukelir.pdfIn PDF document text
    • https://priscar.com/documents/files/gamekopelaxavuvokivi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dedojokufojuvovon.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/62395448663.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/28322642329.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/suvuzorifez.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/berik.pdfIn PDF document text
    • http://badgerhillfarm.uk/xefotoromonikoluvupo.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903020113_274089928.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/69932646171.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9f3835c3c1bed8afa5d676d5a4562f5a/88747789113.pdfIn PDF document text
    • http://machulski.com/public/file/kaveruvopado.pdfIn PDF document text
    • http://vititanon.com/user_img/files/27893733066.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/9924318005.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/19912357462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tcpdump+android+appPDF link annotation
    • 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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 10292 bytes
SHA-256: 1beea347da2484a5a9c602556921213231846524be4349043609d08e2a77f6f9
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 18056 bytes
SHA-256: a0f3e565687c909bbff374e41a2b17e21e4be41e1207a9f1c61ed18073de89fe

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