Malicious PDF — malware analysis report

Static analysis result for SHA-256 897bd43d5c42b00f…

MALICIOUS

PDF

78.1 KB Created: 2021-02-28 17:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aa39d6c41518e12243b4205be7b78a55 SHA-1: 6c4f43ba34ffaaabe9d64d8806778d0059337554 SHA-256: 897bd43d5c42b00fd7aa6c12851cdd57ff6f83403748ac7435a1fa8c50f7ddfd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and heuristics strongly indicate maliciousness, with the PDF containing numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of a link farm on disposable hosting suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=dance+marathon+indiana+state+university PDF link annotation
    • http://vetebozo.mypressonline.com/padi_advanced_open_water_deep_dive.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/boviguguvovuzugi.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/rascal_600_scooter_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fced165e142f.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/how_to_reset_cobra_car_alarm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_6029d59a781dc.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/63499948524.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/51e8c5e046ef5c.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/schlage_keypad_deadbolt_home_depot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fd658ec37440.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/tarot_card_combinations_love.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/9217228.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/36040172648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/boy_in_the_striped_pajamas_analytical_essay.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/ninufo.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/27456655050.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/fumofekogezupuwa.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_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 5308 bytes
SHA-256: d2e1a5df1330e12ffb63ca8c093e83ef3c6dc6bbc75f704225f7b9c3f37e4162
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10776 bytes
SHA-256: e0dee681d6bd1c7758b2fa9e33706e3581797f68a276695e70b5d7c851b9115d

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