Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5282c9a3c66af36…

MALICIOUS

PDF

62.7 KB Created: 2020-12-24 15:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 52d73c8391f1b3e1bae04234b81ad048 SHA-1: 41f346cf97c1e5f317ead64af61eac7a6478cfba SHA-256: f5282c9a3c66af366272b76b8202cd6955d930ea1b59590c077d76453e063044
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://cctraff.ru/wb?keyword=shark%20evolution%20roblox%20dna In PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/4d58cba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fc4ac53c55d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fb93ca4dbb90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5faf5df451d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f911be2a3115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5fd18ff1c6681.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/586a08aa-06af-41b1-8ca9-99a7de4feadd/etowah_county_warrant_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6af6976-34b9-482e-a7cc-9e027aee271f/magic_tree_house_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/47059847032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cc61ef-243c-492a-9660-39790d0d1473/2292397701.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/formation_assistant_comptable_afpa_forum_global.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64155822-39ee-4094-bc88-fe800d368da5/art_merit_badge_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f1bece-8853-454c-ae27-2668b35b81d1/lingala_words_about_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf11492d-ee93-4ef2-b7c0-0684494382d5/how_to_make_an_unturned_server_for_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aeaca03-ef47-4369-af44-605973d48793/simadre_ct520d_manual.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_off0000ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 5168 bytes
SHA-256: 1b1fdffe2d6a8bc6f9cc093e9566c71a4b4eb2b2a7e3defb87112a21d6b62c49
font_01_sfnt_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 10088 bytes
SHA-256: 61bce7f9066fdcdb6344d653dc29512592fab31c3c8c46d946039a1c71f5cacb

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