Malicious PDF — malware analysis report

Static analysis result for SHA-256 5821fbf7c29f0637…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 10:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 4544d8c7a3f4e242513b54dff2577c40 SHA-1: 93eea66d6d18faaba12cc65153f71f5382d3bfb1 SHA-256: 5821fbf7c29f063788f9f84fdc0e4d075ba7bd7bb3bafe06349e284889078a28
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=o%20que%20%C3%A9%20o%20que%20%C3%A9%20piadas%20pesadas PDF link annotation
    • http://gekodejevotug.medianewsonline.com/27009091979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fc9bf2ec43af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fceda745d830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450145/normal_5fcc370a50a74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_5fed3ca1cc81d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_600b51c75dcae.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/26454102435.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/how_to_use_a_metal_lathe_machine.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/55230315105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ff00fd-dd25-48c3-b326-7a09db6069aa/uc_santa_barbara_sat_scores_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78458fc-c5c0-4387-a807-8c57dcee9fee/30612846645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d4d048-208e-46f0-8e2e-4b4f4f351bc8/jebetavawufewisonubomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2822d1-5d5a-4f33-9bd4-b5d30549ce1d/engineering_mechanics_for_gate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bda06c-2269-4ac8-8d4e-e106f70cbfb3/62594254289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a724970-6d4c-4461-b5db-88c84e7b25c5/nopiboderakiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2bacbc-0a27-4a88-a507-11da3e7bed5b/excelsior_springs_hospital_physical_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f65bc3-3164-4871-9839-c63e0ee72961/how_to_use_a_4_amp_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b72fe41-dd33-486b-9c11-accb30aaf02d/8030738451.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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5120 bytes
SHA-256: 83053161cd55b988076092f532293f9748d54c7261712269e8ec0fa07aef9bdc
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 11848 bytes
SHA-256: 3420634cc05f814b5ec2993d19a0f9f93cd142c5da0d01dc0a5b79fe9d12ff40

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