Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28481a12cb856f0…

MALICIOUS

PDF

68.3 KB Created: 2021-10-04 07:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d0726d9e040dbbd78cd31b792351a10f SHA-1: 1ae5c04e963b23f0687ef9c461ea6de3c6906c23 SHA-256: b28481a12cb856f03ca1434335aa23db4ae05d8837441a2efefa80de14b73279
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the 'link farm' heuristic indicate a strong intent to direct users away from the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+split+pdf+pages PDF link annotation
    • http://mgbig.com/upload_fck/file/2021-9-2/20210902135045124997.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/robujisujudidusugal.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/940643152b5dbabb8018e39096661df9/nedajubijotulebet.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/85389788115.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/29351295308.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/19521325605.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/25002142849.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/kubixesiz.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/3114488567.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/7997302755.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62338778168.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/karibevojovanap.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///fotepolugegoz.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/bubunujetokir.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/459493286.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/vetojemomusu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3b532f5844b1bc6737638450a0ca03b9/laxefoz.pdfIn PDF document text
    • https://norservis.info/files/files/tabojumunipose.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210928_4D5D5807327BBE2D.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/99997740945.pdfIn PDF document text
    • http://pinxedien.net/upload/files/genivaxatode.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/tarigekolovip.pdfIn PDF document text
    • http://marymo.ru/uploads/files/lodivupalapomixirex.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/27586472519.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_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 14788 bytes
SHA-256: 3e8f2e4540ceaa62a91f7b2b30db8cd19790a3b83d33d5a2c4b11de7ce1f6aa1
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 10544 bytes
SHA-256: 163775ea097255b9630e215ae63bdebc0b584ed4d530b75b0552465b6750a8ea
font_02_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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