Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ec04f2a9cccec6…

MALICIOUS

PDF

74.9 KB Created: 2021-04-14 11:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3eca526e557bc0a52105c2da3f02932c SHA-1: 59b87f76ef71f546dc22d9dd24e6ec84da2a0b15 SHA-256: 91ec04f2a9cccec6b25c9f81c9cb4be6869b3efc4d24e932ff74c23561515524
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 0.9996

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://soxebez.ru/strik?utm_term=ohsen+watches+smartwatch PDF link annotation
    • http://dajexori.mypressonline.com/angel_caregivers_private_limited.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/sigmund_freud_psychoanalytic_theory_slideshare.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/39927214070.pdfIn PDF document text
    • http://gk-kuban.ru/stock_market_live_software_free_download_for_pc0dmcb.pdfIn PDF document text
    • http://gvidilon.ru/dowujorifotesfhtii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_604e62c1dd3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_603337097bbf6.pdfIn PDF document text
    • http://it50life.pro/dukodizupuzurazafosikaxoojrjc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_60063e540f5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6012a87e06477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_600918ef50975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5ff783d8e3570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_604f2e49e6c0e.pdfIn PDF document text
    • http://qlemelest.online/47351735024oh1kd.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/gDgUgid/amaze_file_manager_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/Cz4lKgi/radio_shack_soldering_gun_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_600f3907bb4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_6061d0e514118.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/57mhihj/foosball_winner_game_by_nuwave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_6017c23fe3a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_604b979350447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorikeroz.onlinewebshop.net/vsepr_theory_class_11.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 5124 bytes
SHA-256: 0161da0c9375154b9332f97186131c006bade4a4cb02c22e47dfda59e44c0632
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 11132 bytes
SHA-256: 3de40393f87a1e014bef40053744aadd826f6e707b517e0c536ce92f2f3d2a3a

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