Malicious PDF — malware analysis report

Static analysis result for SHA-256 479f80827b40a516…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 07:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3f3568a5cf1177f499054c65e881e539 SHA-1: 6ce6aafe96f6502a79062d7c2abaabe5195b1a21 SHA-256: 479f80827b40a516aa089fe23a4773e9b247b55635fff248e9832a76bc9bea50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on domains that appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using multiple distinct hosts to obscure the ultimate destination, a common tactic in phishing campaigns. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://baongochoa.com/upload/file/28761727150.pdf In PDF document text
    • http://rewitex.pl/userfiles/file/pumexunuzan.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/pabikawosekozelolofu.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/30005265124.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/movivifitoviramexurus.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/4892964027.pdfIn PDF document text
    • https://bor-diing.com/upload/files/xotekimosisukumivut.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/22880314075.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/zotitolabegiwenoz.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/46619711251.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/jezezojidapuked.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/70180579117.pdfIn PDF document text
    • http://glttek.com/userfiles/file/sabizugonimetosotekan.pdfIn PDF document text
    • https://apelhijau.com/contents/files/46550144195.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/51578414466.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614db38ec69a9---xatepesero.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/21505450764.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/4996479098.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/sudadakenikokujofowubil.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/70868232995.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109111435162536.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091920314773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pythagoras+questions+year+9PDF 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_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 18828 bytes
SHA-256: 7c707dcf77ca219ca098d6e2aff9a0acaf70c3094877f87cf196689577c836b0
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 10868 bytes
SHA-256: 0b08d5c794de48e2a0d91cd0ebd65e1a493ddd5f6a267e47f09eae61ab720b93

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