Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6842cfd6a01e8c…

MALICIOUS

PDF

85.3 KB Created: 2021-03-16 13:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fdf0e0e676c821c785be513488ebc38 SHA-1: 99919f43b0696ea49da94742f875fc47f91b3287 SHA-256: 9b6842cfd6a01e8c8e79cb6472f77e54ee2024ede8f7a49df4ef5220bd2142f3
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 0.9998

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://baarspo.ru/wix?keyword=kinetico+water+softener+manual+regeneration PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5fe7932c0c58d.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/34837539021.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/pigul.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/lp_anemia_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fc7543cc6ea5.pdfIn PDF document text
    • http://hookup673.site/starbucks_beverages_sizesob7wr.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/how_do_i_reset_my_apple_time_capsule_to_factory_settingsr7zmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wumipuxupixak.epizy.com/brazilian_portuguese_pronunciation.pdfIn PDF document text
    • http://zixagoku.rf.gd/el_endoso_ley_general_de_titulos_y_operaciones_de_credito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9344e249-1746-4d38-a544-d975e6f4aa2e/38988401925.pdfIn PDF document text
    • http://noxoposuxasife.rf.gd/buxinobepititipovulabexa.pdfIn PDF document text
    • http://sujevulakaginig.rf.gd/65543358738.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/how_do_i_log_into_my_verizon_actiontec_router.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/kagetufafuwagazivumenekov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f98d9a-c600-4222-ae42-14d12053b5eb/fefezimijok.pdfIn PDF document text
    • http://fufibilola.epizy.com/application_format_for_employment_office.pdfIn PDF document text
    • http://maxuzenikofi.epizy.com/brother_mfc_7840w_drum_error_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0508055-ecc9-4260-8af9-3506a4eb7f33/92096363103.pdfIn PDF document text
    • http://wapofele.epizy.com/living_with_the_himalayan_masters_spiritual_experiences_of_swami_rama.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_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 5260 bytes
SHA-256: ea8b3e91b34d6275972d9447872adcd5fcdcb641c5b5b595cabfa04bd2a623f2
font_01_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 11420 bytes
SHA-256: ff8f1c16de263502a0fd0f1a6643d7e63e450380f121775f04ce4ac3b8b78868

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