Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d71288570115bd8…

MALICIOUS

PDF

77.5 KB Created: 2021-03-07 23:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d63ba3bed50c28b6fda7f458510c54 SHA-1: 29bb93bde81112ea14e0bac424569807c6a520c5 SHA-256: 5d71288570115bd845f11473de6b15ba94f1cc1fa26734c25c95801de2302432
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt, with one primary URL being https://vilenefex.ru/strik. The document body, though heavily obfuscated, appears to be a lure related to a free e-book, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=livro+a+meta+pdf+gratis+quem+pensa+enriquece
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/5770189.pdf
    • https://nodikakubal.weebly.com/uploads/1/3/5/9/135966501/dubiloramufi_vatujiwagebe_pakuvuxefad_lulileteriwiv.pdf
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/nezuro.pdf
    • https://vuxemirisem.weebly.com/uploads/1/3/1/4/131453034/sogokidi-fapuvotopa-nisawijixu-fivej.pdf
    • http://lnstagramlivesupportcenter.com/calaveras_para_colorear_dia_de_muertosa8z82.pdf
    • http://koxivesuvif.mypressonline.com/how_to_set_up_hotspot_on_verizon_iphone_xr.pdf
    • http://kitixukizogutik.mygamesonline.org/that_time_i_got_reincarnated_as_a_slime_light_novel_volume_11_download.pdf
    • http://ziximotizaned.medianewsonline.com/tanuzofabawojikuvifiw.pdf
    • http://wisecredit.info/what_is_the_coldest_places_on_earthtam0l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fe05861-13a4-403a-a45e-0d0552262b15/how_to_install_gimp_user_manual_locally.pdf
    • https://uploads.strikinglycdn.com/files/55b1efe4-179a-4def-8f6e-e0e3e0173fe7/how_do_i_use_a_hoover_spinscrub_50.pdf
    • https://uploads.strikinglycdn.com/files/7dd776e2-9097-43b3-9089-79a2024e5669/how_to_open_black_diamond_headlamp_with_screw.pdf
    • https://uploads.strikinglycdn.com/files/0050d35b-a159-4a7d-bbdd-2286b81510bd/amcor_portable_air_conditioner_replacement_hose.pdf
    • https://uploads.strikinglycdn.com/files/f12038cd-73aa-405d-94f6-2ef8b3595dc1/what_is_the_scout_promise_and_law.pdf
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_3a1dabb4ea414db3a4f4d418ccd0b917.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d6f2cc1-0f86-4e33-9516-fb9f54c9f81d/65584746652.pdf
    • https://uploads.strikinglycdn.com/files/5214ad7a-4f22-411d-87bc-f62e821d91af/39470857068.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_a374816984404192979ef99de9ea0a6b.pdf?index=true
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_ee925902f9394c168069adf7dea26e29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7ca4dff-fdee-414b-b7c3-0271a58809e8/add_2nd_edition_ravenloft.pdf
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_30ac6a790ef84f25bf1c7d79f78404c2.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_4d7a8f93dfde4c808e29be7398ad4098.pdf?index=true
    • https://uploads.strikinglycdn.com/files/efeec789-af73-4509-ba16-7facdde80f26/what_are_the_symptoms_of_a_bad_ignition_lock_cylinder.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f275.bin
6fe8889c1d054883ca155619009cbae68663b3727cc9e61d3479a58f5fc3ca0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 5568 bytes
font_01_sfnt_off0001055d.bin
42e5b15a41cfa4bd91aa131983fc440cbe6ed75c91ad12b1f9d3c9798bb1d0c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10248 bytes

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