Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ff3802ec6c663…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 15:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45abaec7ae787d726041d1d5e4ccd705 SHA-1: 5218b9f1757bfe154deb9212ca00cb7c835463d7 SHA-256: da2ff3802ec6c663b5b183ee5e69f5b5ff41695c33765784851629db9530f93f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which are likely disposable. This behavior is consistent with attempts to lure users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://daqing-jewelry.com/uploads/files/202108311745497689.pdf In PDF document text
    • http://taaltoetsvo.nl/userfiles/file/18520164607.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/47848274345.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lugogiwevorubasivup.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/5502935901.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qg9a5lhnbvd474fa2t2a9m1b81/28500801357.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/7087239330.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/60744823207.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zonoposeb.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/1103168562.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/6583050956.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/177fd665a9da7ad1223bbdb02dbc77ce.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/29510975512.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/51990964626.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/kuxobotisivowavupobubovaf.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/linesilotudelowusux.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/ruteniluxujero.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/12701980680.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c30ae8c3e2---xalesofilonevibukudo.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2833851355.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109060036288208.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/jomurigidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ecological+pyramid+pogil+answersPDF 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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 17912 bytes
SHA-256: 84bdfbf889e45528757447b704943365a93d7567a8aaf3f02bb9ac67fed8d1f7
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10944 bytes
SHA-256: d51db762d77eb637dbdedcd594aa368cd157b6fc24ad5a4bce93887aa6714d20