Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea3898662cdcdf6…

MALICIOUS

PDF

75.7 KB Created: 2021-03-04 06:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c7409c5ef8302c52b6dd5391ab6ca13 SHA-1: 917ef7cf5bebc3e0d210a2a0f538d43b766c20fd SHA-256: 8ea3898662cdcdf617c7d898ea5f208bfee1861ba3928ba35276bd5f94c7a7db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=m+audio+fast+track+ultra+8r+driver+windows+7+64 PDF link annotation
    • http://lafarupikawa.22web.org/nutritional_information_for_taco_bell_crunchwrap_supreme.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/83e56.pdfIn PDF document text
    • http://timinome.getenjoyment.net/wibunetazagadesizuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_6013360ae33a8.pdfIn PDF document text
    • http://lizaxexepe.22web.org/23460453327.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/momawok.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/hhQyojb/midefipudokoxonop.pdfIn PDF document text
    • https://tunefanixeso.weebly.com/uploads/1/3/4/7/134733210/zodobe-nesejeduse.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/fhhDSSC/dragon_quest_11_characters_skills.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/1367797.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/PauvEge/angry_fighter_attack_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/ieFc3Mj/78000634217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/23437953968.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/wumedomoraxibanukabig.pdfIn PDF document text
    • http://vepawipexujobok.epizy.com/kegumulinefo.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/bookworms_oxford_free.pdfIn PDF document text
    • http://kadapefiwemol.epizy.com/biomass_energy_pros_and_cons_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/navient_school_deferment_form.pdfIn PDF document text
    • http://duzujijola.epizy.com/curacao_beaches_map.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/mawusoradevufa.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5752 bytes
SHA-256: af18a90c23393c73254024f8719036899d1e1dc61ff11fa655861ad3eaed7cdc
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 12076 bytes
SHA-256: 8173aa5b1d8dbe8e1468ae85b3c75692fff0db74d0338ecad4a7e2a403d48629

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