Malicious PDF — malware analysis report

Static analysis result for SHA-256 381f71917cd6cf13…

MALICIOUS

PDF

70.8 KB Created: 2021-02-17 06:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b6a9bf963da0e31788942b8932b68b6d SHA-1: e6489c0cc63840ce96bfa5be0abb1cc1976b1813 SHA-256: 381f71917cd6cf136a472cd1e754e196554ae8bac7b3c8d69aaaf4bbbc44ee1e
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://yafferge.ru/wix?keyword=clash+royale+freebies.con In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6013a28d3f99d.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/the_wait_book_freei4uv9.pdfIn PDF document text
    • http://stopnutristrike.ru/acorn_stairlift_120_error_codesty62g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fefb3bd6997a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_5fe1ef89f27ba.pdfIn PDF document text
    • http://nigasheff.xyz/rimusuxozu9rbm4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_600a79bb75644.pdfIn PDF document text
    • http://muslims.net/49933133031bcswv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416940/normal_6001cc8e19d75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fca7ea9c39a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5ffcd606208c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457862/normal_5fe39749380b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifexowofimef.epizy.com/linking_verb_worksheets_grade_3.pdfIn PDF document text
    • http://vejemomase.epizy.com/canon_eos_rebel_t5_manual_espaol.pdfIn PDF document text
    • http://fovelevewud.rf.gd/carousel._css_bootstrap.pdfIn PDF document text
    • http://zumebixakefeta.epizy.com/davogewaguvu.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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 5148 bytes
SHA-256: 25b0cb94afcc62ce2150777e36f27f19cc1fb31516ad4cf3c319f056379d8382
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 12804 bytes
SHA-256: e8c6adcd176018092a9df8b8a8b0adcc2430755d2c9b04367f2b5a5073a4e531