Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e41cfdff20354d…

MALICIOUS

PDF

44.5 KB Created: 2020-11-08 02:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b887246043b3e60f12947ce9fe14e85f SHA-1: a3a8dfd643801b82f4ce88c603efdda4829d4dd2 SHA-256: 83e41cfdff20354d73f714676f3a9de5bf9746de1bb73090ea5b324520e8af13
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafftec.ru/123?keyword=pros+and+cons+about+supermax+prisons PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f9a3756db2c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f877f291feba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/luborinizu/lulavonizuxoge.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/woodland_elementary_school_kentucky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445059e8-e0e6-40f4-9073-42a21b4f0d1b/diwufevumetupegefa.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/maintenance_of_resting_membrane_potential.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/21581354024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360f7173-c62a-43b5-83ad-8598d57aaeac/wemen.pdfIn PDF document text
    • https://nozijofikudo.files.wordpress.com/2020/11/wajawubibavol.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/dikipuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/33495636529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98b167e-7d66-4c6e-b1a8-30044c469a59/7816414450.pdfIn PDF document text
    • https://lidevan.files.wordpress.com/2020/11/iron_maiden_brave_new_world_songbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 5280 bytes
SHA-256: 86f3ed61abf0fd32e7b0965bea93bcfff67db2a87de98596210a8e9cf231538c
font_01_sfnt_off00007617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7617 9620 bytes
SHA-256: df45cb8d0180a9cbb597e333dcc1c9a203a5a5ea4c377e23d99d55b6a92e487d
font_02_sfnt_off000096e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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