Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4775c7e104efaa…

MALICIOUS

PDF

68.1 KB Created: 2021-04-02 06:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8908695e46bef0ffd41a5ea3fd16bdab SHA-1: 398713e5910ed6c4fc1223a5c4ab2f64d79ca574 SHA-256: fc4775c7e104efaabddd9fdd05690a854182f2e8937583046d65d792466867e0
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/aws?utm_term=why+is+my+garage+door+light+flashing PDF link annotation
    • https://cdn.sqhk.co/deliwewofok/mxOEjdp/punifipone.pdfIn PDF document text
    • http://lulizukudomiz.scienceontheweb.net/buddy_system_at_work.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/fQbDjgJ/sky_sports_live_scores_premier_league.pdfIn PDF document text
    • http://lessonsonline.site/27343668853gbg4x.pdfIn PDF document text
    • http://uablog.site/75722312872dxrlk.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_create_a_word_cloud_from_excel_data.pdfIn PDF document text
    • http://chunyoo.com/maforefoxexasedufekiruj1orqf.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/intentional_talk_math.pdfIn PDF document text
    • http://kieverts.xyz/free_month_to_month_room_rental_agreement_californiaiyjkb.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/jebfhjr/target_universal_replacement_tv_remote_control_manual.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/html_to_c_free.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/ipc_a_610d_acceptability_of_electronic_assemblies.pdfIn PDF document text
    • http://disconto50.pro/mortal_engines_1st_booke9e5k.pdfIn PDF document text
    • http://instasale.company/sujakakoxijugipotisetwzxim.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/3c514737-eabb-486b-a62a-81bf00f77823/polygons_interior_and_exterior_angles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1d529b-0587-4a85-85e5-4de9edb8b0ff/pcir_reproducible_answer_key_world_history_shorts_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f23d49-87e3-4d9f-a4c2-a2f4e9c3ef26/cursos_de_ingles_en_linea_con_certificado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f4217e-afaf-49bc-a256-1d1bcda2684f/jipakule.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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 5436 bytes
SHA-256: 8a1f6eadd8db8412a6a7dd06174214448f7bb310f233e980c643d4e8e860a1a0
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 9468 bytes
SHA-256: e98908e2bcac1e24f8eb789d4c824876170be21d759d1cf1afdd73481ddc92cd

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