Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d981bdbbb793a2…

MALICIOUS

PDF

66.8 KB Created: 2021-02-13 15:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 831e89a8fd655fbca0d9de3be0f083c4 SHA-1: 02c1d4c1a7777219d03b728bbf045396a29a7237 SHA-256: 86d981bdbbb793a2f96de76393e744b8f733df4d02acd460e7bcef92ec09dde8
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://bologen.ru/123?utm_term=blown+to+bits+chapter+2+vocabulary PDF link annotation
    • https://cdn.sqhk.co/sabepakofo/hjjhgcO/cthulhu_virtual_pet_2_codes.pdfIn PDF document text
    • http://nowofuguvinidaw.iblogger.org/formation_en_aviculture_au_senegal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5fcef82a767a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_602407056e84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_601d28f59d4e5.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/ghh1thf/retro_fridge_freezer_mini.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/gRBggey/phoenix_zoo_discounts_ebt.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/icih2LR/best_recharge_for_videocon_d2h.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/ikjjgg5/cod_cold_war_release_date_xbox_series_x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5fc7613b2ad11.pdfIn PDF document text
    • http://solimurelorobiv.iblogger.org/7403213020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxotenudiwuzu.rf.gd/contact_us_form_template_php.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/11603512823.pdfIn PDF document text
    • http://vuzosaxa.epizy.com/worksheets_on_final_consonant_blends.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/hedwig_s_theme_tune_piano_sheet_music.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_off0000c750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC750 5596 bytes
SHA-256: 24ba59f9c0f5f0cd2224e88f8e078dd11e9f3c285fd441eea4a099438c9229b8
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 10576 bytes
SHA-256: 0116a4b7a70d0f6d7142a0ca5986a6e653ed3624c5fc9dc4fb0835d2d4bdd192

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