Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca8b3b042dd4cd8…

MALICIOUS

PDF

72.1 KB Created: 2021-02-14 20:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: cdfffe7b3ba221c44a2ddcc7d6faca1c SHA-1: de9f583bdbd9280c4fcf60bf34d6561281e0606d SHA-256: aca8b3b042dd4cd83506760b3815b58b5a77c115f9a5dfaf1ee8f60f3d5d7947
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/wix?keyword=holt+mcdougal+algebra+2+textbook+answers+pdf In PDF document text
    • https://cdn.sqhk.co/satofurijob/qgj9pye/atomos_ninja_v_battery_kit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_5fd0e6378b97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_60057a321fdee.pdfIn PDF document text
    • https://cdn.sqhk.co/gomovufug/qhfdhf3/junepevanizinekek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_600de95799516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469860/normal_5fc95b48096ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_5ffcdeaca9c39.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/ygejige/32485149764.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/jbjejIo/43044134138.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/jhfNMKL/nokilewivajibom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fd15ec0a4281.pdfIn PDF document text
    • https://cdn.sqhk.co/vexagajezesa/jz0hcyS/ketchapp_basketball_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5ff9a97b3f3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_6020c9aaedcda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rotowan/nba_finals_game_4_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/budgeted_cash_flow_statement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/grammar_worksheets_for_adults.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5932 bytes
SHA-256: 1996a01768e8881d42082efd198e489a880e4df1a57de986ab3da6ad0e6eb6da
font_01_sfnt_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 14596 bytes
SHA-256: 1d88f2b625a328c6ce0a7c9fd4f79fd7c8c1975b66b9624a3978f11de820cd6f

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