Malicious PDF — malware analysis report

Static analysis result for SHA-256 7723a1377004316c…

MALICIOUS

PDF

97.0 KB Created: 2021-04-14 10:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f692fdf3b26d1bf166b620cbdcfbd817 SHA-1: e0bce12e8a8dae8d8bfcaecade25bf20bf007e97 SHA-256: 7723a1377004316c990418362ea1a4eb17240e75eceff48f0c1c328a70a01e8b
226 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. It uses a password-protected-archive lure. 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 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/strik?utm_term=como+crear+un+archivo+csv+en+excel PDF link annotation
    • https://cdn.sqhk.co/zoxunoromi/cDxDmql/direva.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/supawomegupaji-zemakebozisetax-tanasowuwa-wenavew.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/ITp6Pgi/61729567669.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/gfhejcL/classic_kawasaki_race_bike_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/ijP7Qhi/events_near_me_today_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/ax6gdzK/80014618604.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/rogijefujelotuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_bd5c57a499e042f58811e9ed59b1faf5.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_1355b8aa879d4fd6bd5814b30986bae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8bfc06-0c69-4d22-8e85-e3b7cc8f640c/international_business_law_news_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/axe_fx_2_xl_plus_amp_list.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_3b51844708224958baf420cfd933d85f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/nejepazosixevufelogugedun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4269b176-a766-4bd9-963a-8165fd8c758d/campark_trail_camera_t20-1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afff2fa6-4c16-4069-a630-d419376b5eb4/88289127645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac084901-bffc-42cb-8f04-d120ea8ba952/51712406860.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_47a88557a3e3477a8a865efe0e0f4488.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fa1bef-d7a0-44f8-ba78-28780fd58c4e/how_much_does_a_site_engineer_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc25675d-83cf-4500-9284-49097c5257cc/how_to_program_dish_hopper_remote_to_new_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406b06cf-d1e4-4823-bd77-af3a978226b7/givinixuzag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9085c918-b81b-466e-b84e-5fefd87dc8d4/how_to_get_velocity_from_acceleration_vs_time_graph.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_off00013b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 5072 bytes
SHA-256: 10f316e79b96acd12067e21bbbd8f581e78b58821b83d90771aee4393ba894b9
font_01_sfnt_off00014c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8A 12324 bytes
SHA-256: cca760ddd267a6ed63310f20e8ce279641566dffb9db49f91d54cba525ac4467