Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec15fa95a1dc6d0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 10:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32dca0a6a0a290ba68917c1c9899b3a0 SHA-1: e17fc94ea60bc66a872b2da09719972b9b343cbc SHA-256: 8ec15fa95a1dc6d0f3c963a5e784e00ab3b7a575cd41c48ad09def238bbc72a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the overall structure point towards a spearphishing attachment, likely leading users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=burn+after+writing+pdf+online+free PDF link annotation
    • http://wernitznigg.at/files/kodev.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/84977554076.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nurulekizawofofogupuru.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/28917964534.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/57511796937.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/kemil.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/32656953577.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/lisedeb.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/garelus.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/28106070227.pdfIn PDF document text
    • http://domuran.pl/files/file/48411493370.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/61904173193.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/84286806807.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/63002595680.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/gumegivejoxarilodoka.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/wupos.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tokuvisojip.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/80815997399.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/7784925798.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/fedexozinikebinamipa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140926abacbf---57772351713.pdfIn PDF document text
    • https://km2804.com/ckupload/files/rejebimu.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_off0000af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 16132 bytes
SHA-256: 3244b9aad7598044e8ccd2621bd11d810d46d81ec4be6f2783920be514a4a9ba
font_01_sfnt_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 10744 bytes
SHA-256: 3201237251239db613f7f6c68633ebe6a31de02cf4c22fcdca88481fe972f1c2

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