Malicious PDF — malware analysis report

Static analysis result for SHA-256 6182ce4c5961ea53…

MALICIOUS

PDF

78.5 KB Created: 2021-04-15 04:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d33db9571f19b4a5b1005e8ef5141cf SHA-1: c0e794a922ffac2d08148f07b961e07f58d38809 SHA-256: 6182ce4c5961ea53ef6cc49fcd426459a3df259c5201427e53350ec86b0209b9
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=d%2526d+3.5+underdark PDF link annotation
    • https://cdn.sqhk.co/rowazazapa/efsheha/orange_tree_podcast_laura.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/zgggiiW/fox_mountain_bike_helmets_large.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/brADVPF/14935545968.pdfIn PDF document text
    • http://rocketdocs.us/z_table_98_confidence_intervall9t8m.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/ZgeJXT2/police_officer_pay_scale_utah.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/jhJhgge/metronome_100_bpm.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/f0bgj6T/iihf_juniors_2020_live_stream.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/zaxikijogajekikor5u.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/3jbjcgc/52676885288.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/gjcSLja/instagram_login_help_signing_in.pdfIn PDF document text
    • http://erogan-oficial.site/best_way_to_learn_python_programming_freezm46j.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/t3hgJze/tobeco_super_tank_mini_drip_tip_adapter.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/jeiHyMD/27887464491.pdfIn PDF document text
    • https://cdn.sqhk.co/genazeres/dhbHha0/voa_urdu_news_live.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/uXjcfLJ/tiles_near_me_open_now.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_f50c6b4d2a6d46d0a0d01967eb42018c.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_019854e31328445380a9dea6d9f74cba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mulerux/4163064659.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/certificate_of_origin_template_uk.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_561e50e11686442aa4d14f9b77dbe75b.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_a369529bf4cc4d0aae6631285067e3bd.pdf?index=trueIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_38e4135e47014b30993709e6e81fae7c.pdf?index=trueIn 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_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 4156 bytes
SHA-256: 58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 11712 bytes
SHA-256: 4942e111f974740a0035413c9ac14155a58f1a024cb34e201f3d6e401325a8ab