Malicious PDF — malware analysis report

Static analysis result for SHA-256 db37853002fc6624…

MALICIOUS

PDF

59.3 KB Created: 2020-11-11 14:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f9f3b354114c3f80ab6f6951ad48418e SHA-1: f6effc17149ecc4f4958099ef0d245ef248164c7 SHA-256: db37853002fc66242c5dcda9a76f5f4a30cd19088b46e1c3d96a3f50c6f5191d
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/123?utm_term=papa+s+cupcakeria+unblocked+77+at+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5f9a3bc586af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5fa3ba2cc440e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5f8dfbf98c39b.pdfIn PDF document text
    • https://zulewawasukuxu.weebly.com/uploads/1/3/4/5/134581955/972000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_5f9d08c6b1947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/537adff2-540c-46bb-b5b4-1e83b4f5e121/sijujijozegedusere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feeb7128-cc9d-40fe-ab17-7c039d9b2cc7/octuple_compressed_cobblestone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2083fbc-2282-4609-946d-bd9b845f6ebe/the_gratitude_effect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabc266b-7d89-4431-8540-5ea57f3483b7/bimimosigegeresefek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb689199-db99-4755-9b3d-f811fe573f72/biropejitefizokuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c44f2c5-9e47-4a34-ba39-1ef31a128468/earthworm_dissection_worksheet_answe.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_off0000ad2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2F 5444 bytes
SHA-256: b6084deb45849ad259a1f37ef0218593117990f998cc03d45f7340c095ee2890
font_01_sfnt_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 9780 bytes
SHA-256: ec1a5e8b6fdc255d06f64fcc7385bb2e93ef2fa1fe9ba5fa0b74c24184f145a6

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