Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61e1d17356259c3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 04:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3af6a8ab06f9479378edcc96a787ca93 SHA-1: a4f6199ef89912c869cdd1923064185b8a2e2f1c SHA-256: d61e1d17356259c319b8cf87af0984d88cc082db7b868fe0cdcd41e7654c2a21
126 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are structured to redirect to other PDF files, suggesting a link farm or redirection chain. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=tuesdays+with+morrie+book+review+pdf PDF link annotation
    • http://www.udelimpa.es/ckfinder/userfiles/files/mematagusuvazom.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/volawokisepade.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/ririwirutosuziwejeso.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/27499673791.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/jarapoxatebifinukokajifip.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mexaderisolojibomixiso.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/kifez.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/25779951793.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109021201315752.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/dewowigegixikeliwejavix.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/rojurodu.pdfIn PDF document text
    • http://underbutter.cz/download/foto/mewudale.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/36281984384.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/kawolulu.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/49270392245.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17922393751.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/32628561071.pdfIn PDF document text
    • http://enricobarraco.com/files/74474129845.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/62162486470.pdfIn PDF document text
    • http://info56.ru/userfiles/file/wujokudifirokewoxonuzatap.pdfIn PDF document text
    • https://primer-spb.ru/files/files/14460163419.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907121913.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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 11172 bytes
SHA-256: 2bf74885f1fa0aa7bbc5edd6b06679d3c969d3afb070de3d482266f7fd73ae33
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 17928 bytes
SHA-256: 5a11c00181c86d36aa2f0c6542482d421afaf4101e352708d8df84fb247d3b9a
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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