Malicious PDF — malware analysis report

Static analysis result for SHA-256 b865314a66bac88e…

MALICIOUS

PDF

75.4 KB Created: 2021-02-22 22:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 621aa4f4ad1f2bb6942b8bb94a13abb9 SHA-1: 6bed1e2dd92f541265942c7132137e3ca4b9ca7f SHA-256: b865314a66bac88e92b59feeefab6704f6c12089d027d1be5eb8652b2cc6f11b
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://crophysi.ru/123?utm_term=how+to+draw+a+boy+step+by+step PDF link annotation
    • http://reduslim-eu.site/74670462899vnpp8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_6026e1d9daf3e.pdfIn PDF document text
    • http://lagujegivupani.22web.org/commando_2_filmywap_movie.pdfIn PDF document text
    • http://moshon.space/2020_bmw_x1_owner_s_manualoe6nd.pdfIn PDF document text
    • http://dfwshootersupply.com/citrix_adc_sdx_8920_datasheet6f9d6.pdfIn PDF document text
    • http://theporte.xyz/mobile_app_development_software_for_android_and_iosua3g6.pdfIn PDF document text
    • http://magic-world.site/gostream._site_not_workingqpvpe.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/bjiiiL6/xobowirofutajidiga.pdfIn PDF document text
    • http://hookup157.site/jesimavevower5wwhx.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/P7ihier/park_management_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_5fe7311d9d361.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/CYihTzS/61022665092.pdfIn PDF document text
    • http://brumbum2.xyz/harry_potter_and_the_half_blood_prince_movie_transcriptzmpzx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumejusatojajeg.rf.gd/all_colours_name_in_english.pdfIn PDF document text
    • http://xibubew.epizy.com/sizigesiraxisasuviwez.pdfIn PDF document text
    • http://jatomadot.rf.gd/38360020457.pdfIn PDF document text
    • http://xamawesurasido.epizy.com/mavawemovuxaroz.pdfIn PDF document text
    • http://tizivedimusos.epizy.com/how_to_use_everbilt_hinge_installation_template.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_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 5216 bytes
SHA-256: da74448a124fea0a139ce3490875a01b0ebf236dc8ec22fb0c22508d6fb71886
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 10444 bytes
SHA-256: d60594ea636da22259ae812175cbe44ad49bea048bdd5ed4c075c747ccc3ebe9

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