Malicious PDF — malware analysis report

Static analysis result for SHA-256 a180155dfd13b793…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 10:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 487aad5c1714065b97c89ef040ae27ea SHA-1: bf041341cda7aff4885500aaea8bab5b969ca2e1 SHA-256: a180155dfd13b79307c3c56eb1eddcbd3ee43e5490cbf5ea797a973f19b41e49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://kstraders.com/userfiles/file/50824830114.pdf In PDF document text
    • https://morabia.fi/images/file/zegefeb.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/juxazemigiladin.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/rigotiwipuvubexubaselufi.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/zixunapole.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/defariloxafemasajudunepel.pdfIn PDF document text
    • https://slide-bearing.com/d/files/wadopelezixu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/667c78fe00d3b5cde43f5436c6e2bdcd/42667156259.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/65875974264.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210909101025.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/26090954823.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/42416072841.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/1145154725.pdfIn PDF document text
    • https://tcremich.lu/files/files/zijefitof.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/dabifelu.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/jixiwevokoliwadowatatono.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dec126d9---19321334470.pdfIn PDF document text
    • https://megalight.lv/uploads/files/46434485627.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/ralip.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kenepilibutitidotepipa.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/ziboguxodo.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/95400405858.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/83040933281.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fejetusojezudewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blade+2+android+gamePDF 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_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 17276 bytes
SHA-256: d407a977725150accb79e13f89efb6a224dfeb37069748a73cb746905339e394
font_01_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 10500 bytes
SHA-256: 23d309f9c3d658d7e542d9499dac8099964ce2ae8d8d3d6772a037cdab07c56a

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