Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e572f486d03b55d…

MALICIOUS

PDF

74.6 KB Created: 2021-06-10 13:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c98dc4623b6bcc32923857bf248336b9 SHA-1: a41769621fb3a22f8791579588d1ba7f5593f590 SHA-256: 9e572f486d03b55db6615d4c8c63c416728d93083bb44063087729250631ee9f
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://krisoc.ru/pbw?utm_term=gta+5+download+android+free+apk PDF link annotation
    • https://mipadabu.weebly.com/uploads/1/3/4/7/134751654/2458500.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451555/normal_60b13c7387eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_60bfb6eee8e19.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/48ab4a.pdfIn PDF document text
    • https://rukepeninosiwul.weebly.com/uploads/1/3/1/4/131406291/dbf943a493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6046fc807525e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_60284000e5ed6.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/ff8831fa-338f-444d-be83-bd0573260a61/the_white_tiger_movie_netflix_trailer.pdfIn PDF document text
    • http://wafijovodek.pbworks.com/f/convertir_imagen_en_word_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643c7fb8-91d7-4cab-8d34-35ce20053b54/1769743360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44b8ffb-8ed6-4e68-872f-18b9f8999f3f/xbox_one_dual_controller_charging_station_with_2_rechargeable_battery_packs.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/144741630/81356676680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd94b6c7-cf77-412f-8b0d-70e5674d1d51/hayward_ecostar_sp3400vsp.pdfIn PDF document text
    • http://feselikebapu.pbworks.com/w/file/fetch/144920151/ideer_blu_ray_player_registration_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5686f8c-e21f-4826-a600-ad4d8cfbe699/sweat_equity_agreement_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f08ea5-3401-4b2c-be04-68e42a8a971d/rupekupivug.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/w/file/fetch/144854436/62910370848.pdfIn PDF document text
    • http://zakikumese.pbworks.com/w/file/fetch/144795834/tefaz.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/f/charles_darwin_theory_of_evolution.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144753465/download_bblia_de_estudo_dake_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506a44bb-dda4-4131-a3ba-d2e63a221d95/sole_e35_buy_used.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/how_do_i_prepare_for_amazon_business_analyst_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d15240d-69d5-47bd-a0fd-fdf2a1299cb9/shakespeare_macbeth_plot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c20ce4c-944e-437c-a546-4a074fc68673/tesupolugop.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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5168 bytes
SHA-256: 39eff900317625888fd68a921c219bf08d45b35b06cda53792f6a9a3fc05c12b
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 12068 bytes
SHA-256: a3843bb3308c030f2b720b21e62c5bfbd061d7892ec99c6c0d3292b6eabd7353