Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a9755d1fb99893…

MALICIOUS

PDF

83.2 KB Created: 2021-02-10 08:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 590e0254250d19f37132be784ad50156 SHA-1: 9939213502b7a65c6dce31baa0d2b00fde9222db SHA-256: 65a9755d1fb99893e4071cdc3888fed322e4adbe85aa9e745ecbe16dac064a71
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, directing users to numerous external websites, including known malicious redirectors. The embedded URLs suggest an attempt to lure users into downloading potentially harmful files or visiting phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=mario+flash+unblocked+games+66 In PDF document text
    • https://cdn.sqhk.co/divekezor/ZCYxL3m/samsung_members_app_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_5fea00d59bf92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde793e9565a.pdfIn PDF document text
    • https://cdn.sqhk.co/tivomepu/Ihhjcl3/hillside_drive_mod_apk_latest_version.pdfIn PDF document text
    • http://hocostyle.ru/best_animated_emojis_for_android95924.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/jehckia/fun_wedding_cake_toppers_bride_and_groom.pdfIn PDF document text
    • http://meetdouche.xyz/three_types_of_convergent_plate_boundaries215ij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fc5b51354c98.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/fieVMhc/wurigoximagarilulasewok.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/zggH1jJ/86386905798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff374ed22cd2.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/web_browser_video_er_app.pdfIn PDF document text
    • http://wupuluku.22web.org/amazing_run_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/rGCIhgy/levumisazobuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/dinamalar_tamil_monthly_calendar_2019.pdfIn PDF document text
    • http://jigufabusu.epizy.com/cheapest_nikon_fx_format_camera.pdfIn PDF document text
    • http://numowun.rf.gd/7131353136.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/mizon.pdfIn PDF document text
    • http://jobiduleger.epizy.com/juluvorikuximugazo.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/abcd_poem_video_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/jaguars_injury_report_week_4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 5600 bytes
SHA-256: e5f5437fcb0f2e3256146665090719d5e2faf11c66349d1f758334c048354618
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10832 bytes
SHA-256: 9b5335a0c67c526f5e3166fd7c9946b36419392af344f920d8d9facf690de340
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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