Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04ef1a4187c5621…

MALICIOUS

PDF

79.5 KB Created: 2021-06-09 19:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92a81c47122c83f388ff8a853fcc2251 SHA-1: da7458308180d54254cdad0aac1a6aca2cd5a986 SHA-256: e04ef1a4187c5621e0aab238b10b78c4ab8a4a53a953bda3eac671c0b7d9f7de
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 0.9996

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=download+fnaf+pizzeria+simulator+pc PDF link annotation
    • https://muvaxajipafe.weebly.com/uploads/1/3/5/3/135313420/2913513.pdfIn PDF document text
    • https://bovojopo.weebly.com/uploads/1/3/2/3/132302970/godeja_vaxokigewij_sebitivo_tofilu.pdfIn PDF document text
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/xajufuw.pdfIn PDF document text
    • https://nozitobolilijaz.weebly.com/uploads/1/3/4/4/134473425/2948325.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/fixifakonuvopeta.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/cb4d317f-d568-404f-80b6-2ede39a4aa9c/40965207535.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/ardab_mutiyaran_full_punjabi_movie_download_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4156d856-1eb0-4e2f-879b-57a0d2d7178b/pimob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc6e3d2-8071-48e8-84cc-cb893944f4a0/uk_police_phonetic_alphabet_indigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5275c5e9-ad36-4485-a1e0-88f22ba37fec/hp_p2035_printer_cartridge_model.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144514335/what_is_the_equation_for_electrolysis_of_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2e1c14-63c7-4d0e-9b6a-cfa9870e3d15/john_updike_ap_meaning.pdfIn PDF document text
    • http://jumedew.pbworks.com/f/answers_to_aldi_situational_judgement_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f97a468-e57c-4190-a62c-a4e514b1454f/el_dador_de_recuerdos_capitulo_2.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/what_time_does_walmart_open_on_easter_sunday_2020.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144617571/25023687754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12992f53-311e-4bc0-8838-37620ac75f4f/8185552395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc22084-5bf2-41d6-8202-a5cc5d38a2e3/xunurikafexevenolexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0918d22b-b715-4a69-b234-81f0203a6e0b/agno3_nh3_c_hin_tng_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1112a8ae-bc90-4608-a6b7-f315bfd4b44f/how_much_can_a_3_ton_jack_lift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0276ee48-7bce-41b3-9548-de8dc64747d0/38446227945.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_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 5440 bytes
SHA-256: c1ee9ce7671e45c9655dfc552d8b53b05aac24b6e5cfce0519a443d0a0e07d45
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 11448 bytes
SHA-256: 91c5c4f656b10705ab37f8c4a73452525dd54b5562faaf87ace2f90240a170d1