Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aeeca2df7dad9a…

MALICIOUS

PDF

78.8 KB Created: 2021-05-12 03:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 366129ca9c3f9d776a06479a92973a30 SHA-1: d80dabd3a57f9101c0f62f9f2ea11dc433640ca3 SHA-256: d3aeeca2df7dad9a37d8a13a732e2f5a7489c2cd80c12bb02396a31a3c0155a2
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 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=toro+string+trimmer+head+removal PDF link annotation
    • https://cdn.sqhk.co/tononapiwaso/bjiYvqy/caregivers_home_care.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_605ee66495754.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/bhgggjh/build_your_own_solar_system_online_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5ff9ee4898b24.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/dicAur0/56763308333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5ffb97dc6078e.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/9d2f4a57-e692-42f6-8db3-c5b19983e669/operations_and_supply_chain_management_the_core_3rd_edition_solution_manual.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_2f45926ff68d429dbe0659c71ce75734.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bacd70-af2d-4f29-888f-7ed3f2a46c21/xaropifelumifunev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189ea5bd-4fb4-4f98-ae72-92170ec0b5fe/54056600624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96181285-fa82-4a44-8793-7155897d691e/gonusuwasumozizemadiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6accc3-f2bd-451a-a643-71d2bc7588f3/conflict_management_styles_animal_analogy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a100e76c-fac5-4022-8040-273a4cc2c1ee/cuentos_de_eva_luna_walimai_resumen.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_703ca712bcb048a98f975e36c960f5dc.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_c330cc2e752b4fb78a9c2aeb589ff6c1.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_c51698be349d47a19fa2adf6ffd5e999.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd311e8-1ead-4ada-99f6-486c0a50c3a1/how_do_i_buy_stocks_in_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb394d77-b528-4aee-b874-1cd1ce59000f/why_is_my_acer_laptop_battery_draining_so_fast.pdfIn PDF document text
    • https://e181841a-b5e1-4712-8d88-fcb0da9a1487.filesusr.com/ugd/2f8cea_8e097e3ffc864f9f9d26af9fa648725c.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_6a89e94f503e4c39b5adf81665e7dc17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0b47b3-9353-40d1-920e-9663fad6132c/how_to_adjust_chain_oiler_on_husqvarna.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_42c76b4d8f9543849368bec67a601861.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_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 5248 bytes
SHA-256: f218f71c37aa5f7a5bb6c8dc531cc36d0d1e48dc3201131e3dc5a500ca6e6667
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10656 bytes
SHA-256: 76faab4da7f22b8e924f7c628e44080a69fec3490eb1487a262955a694b93aa6