Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ea3d5034dbf481…

MALICIOUS

PDF

72.6 KB Created: 2020-11-09 17:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 3328a5a99caf964ee0dc0897c60cb1bb SHA-1: e5e0a0972276dc85de4cab828d577fdab3501b2d SHA-256: a8ea3d5034dbf481d3131d152b1484712fed46647395970b42e4d5e6cbf1cc1f
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://trafffi.ru/strik?keyword=methods+used+by+historians+to+study+the+past PDF link annotation
    • https://jinoxunetoxufa.weebly.com/uploads/1/3/4/6/134698665/5903874.pdfIn PDF document text
    • https://mutodebubopuvom.weebly.com/uploads/1/3/4/3/134373551/18a537cbc.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://uploads.strikinglycdn.com/files/12feff22-cd9b-4fd0-aabc-46492781db77/72757144920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8605f03e-1d6c-4ea6-9e4c-ff8384e5c5bd/hdsdr_2.76_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/mogetumorilaxinigumuruz.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/example_of_clustering_in_prewriting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0a6e5b-6520-41dd-8d5d-9c686ddd51da/how_to_get_negative_karma_bdo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/chapter_2_origins_of_american_government_test.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/how_do_warlock_spells_work_in_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bc5a33-4312-47d5-9ae8-5ec434c79ba2/wakimadabonavapegab.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/temperate_grassland_primary_consumers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecf504f-13a1-4a31-9993-061facf25024/book_of_soyga_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce18447-ba32-4c3a-97a6-30db8d5467ce/dumonupixuwakilidafad.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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 5144 bytes
SHA-256: 40634f5c1272a98b6b7c992a2f10773aa7a54a61d3edf39c09242731ae60722e
font_01_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 9960 bytes
SHA-256: a985c3cf7df9b403ed178805b3caf4739fef8547b3267fc5c4a1b87ed3782408
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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