Malicious PDF — malware analysis report

Static analysis result for SHA-256 f495e0e52cdb28e0…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 01:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 903e9953fff0018265d3dbcbeb629cf0 SHA-1: 0be269c49e5cdfc6360a91b8a935cc00aaeaf29d SHA-256: f495e0e52cdb28e0ab6d69414800cd3a4139b599dbfd445a73747eb4cac36486
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

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://pelibifir.ru/award?keyword=les+antonymes+des+mots+en+francais+pdf PDF link annotation
    • http://ijmalan.xyz/tuvixolelexowi80qmn.pdfIn PDF document text
    • http://trendmobile.ru/fm_radio_circuit_diagram391ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475738/normal_5fdde83f88e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fda3e4061fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_6014f7dfe5447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5ff3731d94422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_5fd8262b7629f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebotavafusu.epizy.com/canon_eos_m10_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae97028-4218-440b-b404-5da846aeb2f4/dell_poweredge_2950_server_memory_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1faa9047-604a-4c6f-8f56-b5bd0141bb9b/58329824176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7349e443-d6ee-4ff2-935d-22b897afbdad/zolatoxumifazaxikevu.pdfIn PDF document text
    • http://rawijubewivakom.rf.gd/33966523725.pdfIn PDF document text
    • http://jadufabusen.epizy.com/ng_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817d54ca-8ddd-4fe4-ba50-87c2232ccf5b/95818194676.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_27b4ee29116a42d6aa1c643f39084a3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9dd95f-1c97-4719-aef5-6494e6d4542a/lubaledufelunusuzisunoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d153b5-2f72-4df4-b698-c1ec8ff9db00/home_zone_es00730v_security_led_motion_sensor_flood_lights.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_d574267008974a699f0536fb4f8c4a45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fd2b11-4d7c-4af1-b27b-6bd5801982f1/when_is_e_peoples_choice_awards_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a65414-283c-42ab-8f6d-bb0c46f12f7a/how_to_verify_bitcoin_in_cash_app.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 5312 bytes
SHA-256: 6d2af9f1cdddb5a06b6a22db111c8c58f4df9d31fe6637fabe72d2d4f3e640a7
font_01_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 11808 bytes
SHA-256: 608036970d81699c3d497ce05b1cd033ed08f37f519f9f3aebcb644d0dffa0e7
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16280 bytes
SHA-256: be5c93f85830975468b6599037ccde94e754e58123c5454e71727c6c354f817a