Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc5873089c2b681…

MALICIOUS

PDF

35.5 KB Created: 2020-10-05 12:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 6ab0cffc4e11e27141a611adfb76fc88 SHA-1: 758b96e0562d6e1c4020cf2a8635f462cae33bd9 SHA-256: 8bc5873089c2b6817096daffbb77a7caec86b840412185ccad6cddf3b31c6a21
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/strik?keyword=libro+conecta+espa%25C3%25B1ol+2+secundaria In PDF document text
    • http://files.simonchate.com/uploads/1/3/1/3/131380493/xepojobiwifuguk_gixufa.pdfIn PDF document text
    • http://zijaf.ccepotomac.org/uploads/1/3/1/8/131857120/4922037.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/7139d9a5-0e7e-4150-8b3d-d046ea49d161/gujuzime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d336c4-b78b-46e0-94e9-61b6a42ff9ea/89334735101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d6d49d-a983-431a-80a8-678ce1c01600/20228283714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcbc88b-0bb6-463e-ad34-5af100eca91d/xitiridagenobawuxevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c07765-96e3-4156-bab3-db92b262d59b/87356761515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ec41de-a600-43f5-ac69-1d576f30ab87/ziwupeguza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b53b714-c7d7-4c60-92ed-8b2ab59ea5cf/zifovonakumodamivaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4b3dc7-810a-4a99-be75-d420d7ea5920/76053397458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068024c9-f2b0-4045-98d4-bceedf5453d6/97330768215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e558e44-e58b-4224-b8f0-70a3f3534bcb/wukemiseduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb4983f-a282-4ee8-abe5-83018640383e/dutipuleridokamisuxuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc0ef81-2f70-49f8-90c2-8773a9c8d98c/36711022658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bbbe8b-b7cb-41a3-81fe-ab2549f2182a/lemerufexaxuzupuguranero.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49BB 5492 bytes
SHA-256: a1cca0e7781aa6d1ce3d37ee26b02ed92fad220f4351e54d6103abfb3b043ebc
font_01_sfnt_off00005c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C31 10984 bytes
SHA-256: 9378aeeab42bbe80167329fd0f16cb426ef839b3fd11ba24322269a85541ede1

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