Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dac282bad2f19cf…

MALICIOUS

PDF

67.6 KB Created: 2021-03-05 01:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 4755a19acf18f2a29ff5b60f820b7be8 SHA-1: 43fb25ebe616e47fd61f649fd0b80806759d6038 SHA-256: 8dac282bad2f19cfc9b05b73f7b8d8d5f3605c9c8aef0a8fa1ee4d33fdbaa965
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=kenmore+series+90+dryer+door+switch+test PDF link annotation
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/narozixuzekizugasag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fd289aa4d77e.pdfIn PDF document text
    • http://genokoti.iblogger.org/jobs_flashcards_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_6025780a79ad4.pdfIn PDF document text
    • http://cybety.xyz/fundamentals_of_nursing_ati_test_bankq4sij.pdfIn PDF document text
    • http://pixelbarista.com/kiwidibaxetitarovetaxtkczw.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/vulefulupebad_papetunebu_gagunuganup_kapepovev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_db95594e31b942978c96d9779905ff27.pdf?index=trueIn PDF document text
    • http://govatari.rf.gd/89068815718.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/rmlau_result_2018_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/football_crest_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/39972113633.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/durewibufakedewewu.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_dff4147db4a9484cb38bcfa1116bd31d.pdf?index=trueIn PDF document text
    • http://xewowetakefov.rf.gd/que_es_un_proyecto_de_investigacion_cientifica.pdfIn PDF document text
    • http://zaninoj.epizy.com/logebegegurobobet.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_ff78083f1605432483c3ece04cb69f06.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_7ec93cf7ac7346418ac2c754de6fcfcc.pdf?index=trueIn PDF document text
    • http://vedebimefawimad.rf.gd/behaviourism_and_mentalism.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_67e18a32959641058c53fe9f2c20086d.pdf?index=trueIn 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_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 5400 bytes
SHA-256: 6e611759486173b45ca2978c465a306bbec50b2435713053580143ac019dc380
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 9760 bytes
SHA-256: d1985f7b9b0d4af1ab652c12267dd17a136c9223340804ba6caea88546ca041c

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