Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dfbd4f69b26838…

MALICIOUS

PDF

75.9 KB Created: 2021-01-08 15:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d1c38f6553c6e2f564a24f02977cf164 SHA-1: 39a1df540d4aea6d4e6efb7e9ac3109847c3fdd7 SHA-256: a8dfbd4f69b26838be5b609cd1d957934e50416aa97e2490862c842a71b983f2
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://cctraff.ru/aws?utm_term=android+10+call+recording+root In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f92cf2d83a22.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/USXjdsa/knights_chronicle_rune_rune_build.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5fe58a27c23a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5ff2d26eba287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5f90d86aead92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5fee848b16944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd675af65c2e.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/nowokil/bekelu.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/20717448207.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/seed_written_test_answers_ff8.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/accordatore_chitarra_per_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/astronomy_and_astrophysics_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4feff5bc-0406-4a78-987d-8de2b79f1cc9/gafivej.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/16183076221.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/what_does_facetious_mean_yahoo_answers.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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 5112 bytes
SHA-256: 03a235603be8203fb13e7fa6dec87530a6f07be1eb8e54b88dd07a1b690d6ae2
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10776 bytes
SHA-256: 70877a5c785490268e2d5bf6c69494adacb8203636a70dce5240b8de8cc90eee