Malicious PDF — malware analysis report

Static analysis result for SHA-256 0508e5cdf33feecc…

MALICIOUS

PDF

82.5 KB Created: 2021-05-19 22:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87c1887dff0ed89866b124c0829488f1 SHA-1: 27a0768e61b5a55bb4388b7c148fd65aee14d788 SHA-256: 0508e5cdf33feeccf1afc104de55af2be687d61f1255953af46d12d227b83474
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM rule indicating a mass of external links. The primary malicious URL identified is https://nipisod.ru/strik, which likely serves as a distribution point for further malicious content. The document's structure and the presence of numerous links suggest an attempt to direct users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=what+does+organizational+capability+do
    • https://vapukukoson.weebly.com/uploads/1/3/0/7/130776878/853130.pdf
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/natarumudu.pdf
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/b7cf72a0581b60.pdf
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/xodewubibaferamaxamo.pdf
    • https://rabiwibunefa.weebly.com/uploads/1/3/4/7/134747284/zulolalunola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomiwexuva/busta_rhymes_anarchy_album.pdf
    • https://s3.amazonaws.com/lanaladu/how_to_fix_echo_on_soundbar.pdf
    • https://uploads.strikinglycdn.com/files/bee65a52-76ee-47c0-9b95-744d6d176a63/obra_de_teatro_el_si_de_las_nias_resumen.pdf
    • https://uploads.strikinglycdn.com/files/265d7464-df4a-4fc3-9794-58029d6cebb6/jeep_wrangler_jk_service_manual_free_download.pdf
    • https://s3.amazonaws.com/tuzakifezara/aoe_1_ban_chuan.pdf
    • https://s3.amazonaws.com/gotitibekovi/descargar_libro_el_alquimista_gratis.pdf
    • https://uploads.strikinglycdn.com/files/38e74650-6f80-4710-a3e5-5c5118ef3434/vanoxofekataforupuwusin.pdf
    • https://uploads.strikinglycdn.com/files/33c149ba-5317-4e08-8fa5-3f21128b9860/90402895131.pdf
    • https://uploads.strikinglycdn.com/files/0a4c8789-a19e-4ef4-ad50-737c27fd3dd8/how_to_add_positive_and_negative_numbers_in_sql.pdf
    • https://uploads.strikinglycdn.com/files/93e26988-b9b5-4b1b-80b0-dc7c79f0a9ee/ninja_professional_1000w_blender_bl610.pdf
    • https://uploads.strikinglycdn.com/files/9d438187-d7d0-485f-956f-c3c86b09dce3/72468443540.pdf
    • https://uploads.strikinglycdn.com/files/aee70bd3-b512-482f-95bb-5f17f6781f10/the_boy_in_the_striped_pyjamas_youtube_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/540bdd85-3226-4231-95ff-8325e0373998/vawaded.pdf
    • https://s3.amazonaws.com/zoxewudunigus/26846838310.pdf
    • https://s3.amazonaws.com/fatikonavori/h81m-p33_motherboard_drivers.pdf
    • https://s3.amazonaws.com/muvevanepen/cien_aos_de_soledad_resumen_frases.pdf
    • https://s3.amazonaws.com/zaxawetawupo/65723333436.pdf
    • https://uploads.strikinglycdn.com/files/dff7c015-6b17-49d4-9e23-77ccc31a20b4/free_printable_days_of_the_week_for_preschoolers.pdf
    • https://s3.amazonaws.com/kakekojezutok/30010636367.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_off0001032f.bin
2c2f3b676ea9380496200766b36824a531bef5986ff287bd446e59b7ed4b1f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 5640 bytes
font_01_sfnt_off00011671.bin
7501185a2d3745fdf718c3c05a79c039d51197df08836df60383ac27d03441ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 11040 bytes

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