Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912800c9a91369c…

MALICIOUS

PDF

71.1 KB Created: 2021-02-10 10:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: de8a5a33d1a78720981515907569bfed SHA-1: bc2edf8af156fa14effcc0d4c37b58c596e9345a SHA-256: 3912800c9a91369c8d2a088b5453c0048b4d370fb9b1934b148ffd1cb8a68222
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=kjv%20bible%20pdf%20ebook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_5fe8a917520ea.pdfIn PDF document text
    • http://geniusenglish.space/enders_game_audiobook_archivec59x5.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/XXAYihY/fererevunaji.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/heAijhf/yummy_potato_cubes.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/3EpggCJ/download_snake_zone_worm_io_apk.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/pisutene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486035/normal_5ffd3e0e6999d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_601f859626b60.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/muxegeza/2593329899.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/vodosapuporas.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/marodivovemukazupibi.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/firework_katy_perry_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/business_flyer_template_free_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/busuu_uygulama_apk_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/minecraft_crafting_guide_1._14_mod.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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 4860 bytes
SHA-256: 6d51910d945bfd6dc128d60778df2712c6fe1ff2800d7e0b767ba0d1ea42730d
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 10720 bytes
SHA-256: 1fbe1fa455fd73eb433ffa49e7c213319685220d8ee426f599ea6e4edd77cada

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