Malicious PDF — malware analysis report

Static analysis result for SHA-256 362c8695a9881c71…

MALICIOUS

PDF

69.6 KB Created: 2021-02-16 07:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 45dcf17a9cfc28eeb8181b69775c62a5 SHA-1: f87b8485d6c5bb566d2ce7e5977a3d892c4ebec8 SHA-256: 362c8695a9881c715076f7138b86c164b0acecfd00332d7a7cf8a40405e305fd
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=simple+machines+worksheet+answer+key+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_5fd84cd172ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_5fe6b310c15ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ff7d0d70a49f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405194/normal_6008ed5a84795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ffe4d8dc2066.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/84e3028b5304.pdfIn PDF document text
    • https://nuzaxegef.weebly.com/uploads/1/3/4/8/134857273/193098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5fd0417d971bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fed21a9a59ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fe3c01bcf063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_601a74bb07db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600a0a1af196e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449193/normal_5ffc82225d466.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/8401651.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/1449027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_6001abfd12ca0.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/sebunuzu/pharma_analytical_interview_questions_and_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_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 5756 bytes
SHA-256: 92439492c52899b77dddb5086a42ccfe8f4a0b5e8ae4a9ac08f418c68e026696
font_01_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 10140 bytes
SHA-256: 60a5cef86fdbdb49feb0fc79f3147a7a2795fbf97fb0c81105b080cfcdb5d5be

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