Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e35d9c5466f559…

MALICIOUS

PDF

75.1 KB Created: 2021-03-03 06:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 2de81f6fa8a58f098dfbde3cb2d04154 SHA-1: 9d2f9ed488ef33cbfa8b27993b7a1e6d785d5a30 SHA-256: 18e35d9c5466f5594011ea6a46f8bbc5fdf267af7257f42ea7f5ead36e78ee93
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/123?utm_term=on+writing+well+chapter+15+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5ffe25c45b2e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411926/normal_5ffbc5edcc01c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6011766183236.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/uglys_electrical_references_2020_edition_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60250e282cc69.pdfIn PDF document text
    • https://rajidorux.weebly.com/uploads/1/3/1/4/131453086/8dea773835b06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_5fe82dd58dc0d.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/jifhKhj/bhop_godlike_5.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/42692688136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480745/normal_5ffe715fa62de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5ff9b040c1c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_60270986d18ec.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/Rbohfhh/tyrion_becomes_lord_of_casterly_rock_fanfiction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_6030344e1dcf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/summon_monster_pathfinder_guide.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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 5744 bytes
SHA-256: 87b0301c1000393775ad0bc50df75fd38146f0cccd871a1ff9593c025c88d7d3
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10608 bytes
SHA-256: f96b653a11b52a9633709ffffc833f10453e95eb94b4d74ade54ca4a9211ffff