Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c94bdf9eec2b521…

MALICIOUS

PDF

68.9 KB Created: 2021-02-04 02:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 0f5e5fde9be5a70f5e2719998650367f SHA-1: 8593b3fa31e69628ac019ec38f8325a9d9f1fba1 SHA-256: 4c94bdf9eec2b521b540a1ba0fa831517f73c78991016e73abd16225708dbf0c
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=hadoop+architecture+ppt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_600e70ad6ce7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5fd9e3182a201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6016fd27c53bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fffe15590919.pdfIn PDF document text
    • http://tortomsk.ru/setagokubivaxukenominog5y2cp.pdfIn PDF document text
    • http://max-lifting.store/bluesky_blf_1006_manual_instruccione4sfgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404292/normal_5fec93d2096d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_6001778b3717f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484815/normal_5fe0c235bb663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6011af5e993ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454419/normal_5fcc6ea2b1eed.pdfIn PDF document text
    • http://filemarker.store/tadulatebugibid7san9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fe848ea72fd0.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/tufitijinexu/mvat_audit_report_due_date_extended.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/msi_afterburner_link.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/17020269602.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/direct_and_indirect_speech_exclamatory_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/2017_chevrolet_sonic_premier_manual_sedan.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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 4912 bytes
SHA-256: 469858765c80113f9d66ea182f6af1bf62bb9a82c568017c07ef05c335b77e73
font_01_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 10456 bytes
SHA-256: 767212db42098e59fb226d465c5224ad7fc7c73ecba54fbef2c7ca8347ff4945

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