Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dffe3cd4bdd4b51…

MALICIOUS

PDF

91.8 KB Created: 2021-03-10 07:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4550ac2522f0c6dc692762e38d75891b SHA-1: fd4e16231b5449c7577ea03e53e75aa489bf6ebc SHA-256: 8dffe3cd4bdd4b51b0f4a1a151d55f1a485f0b62c399d58d4a0b073ba90e1bff
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 of which are hosted on disposable domains and appear to be part of a link farm. The primary URL suggests a search-result lure for a specific document. ClamAV and ML classifiers indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/award?keyword=instrumen+akreditasi+rumah+sakit+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/fekepazerox/1jdhchc/fire_for_effect_artillery_unleashed.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/2013_honda_civic_si_coupe_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/KjiiaFs/70701049697.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/Xiggcji/portland_singing_christmas_tree_hymn_sing.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/7QgTlTw/19454678836.pdfIn PDF document text
    • http://gesetaxoxu.sportsontheweb.net/sogegamela.pdfIn PDF document text
    • http://vvd.bar/black_s_law_dictionary_5th_editionallqa.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/lewis_dot_structures_of_atoms_and_ions_pogil_answer_key.pdfIn PDF document text
    • http://pubguckazan.com/609878261641u4x5.pdfIn PDF document text
    • http://barbanapoli.moscow/kusedopemaw6kpa.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/hftNhgO/pandemic_unemployment_assistance_california_for_self_employed.pdfIn PDF document text
    • http://intekzafast.online/4444002960ommzs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/rifunuxa.pdfIn PDF document text
    • http://duvodix.myartsonline.com/diary_of_a_wimpy_kid_books_in_order_1-13.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_86a87a01aa6c44d2b1f76b4b3adaf133.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_8d975155f6f6498fb8474ca6f943a17f.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_c258657cf1a14ef994296c283198b422.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_61ec15fa86e54100933bed3dac39bd94.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_07d85813046b46479ff79cbe7c298ffd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lefemijip/anemia_falciforme_tem_cura.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_343d1ae2ff6649cc9d1584edfec40878.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_439b2a4a791e4af6966fad6b26d27b9b.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_3f4d09c4b5a74da9aecaf4efd2625aa1.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_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 5524 bytes
SHA-256: 768c9ae4340accd2794776d9eebccf55d66e68e1125c726a714602a2d71dc688
font_01_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 10096 bytes
SHA-256: 47bf9f32f2d3925adc3f1d754396af5f7bd75497dc6de3bf916f489d63356ab5