Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cff4864c6dad2b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 18:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 588adf2c82e107020bd32db01797b063 SHA-1: 51a9b49fdd030f32d62eb7f3737aa652f0880bee SHA-256: 90cff4864c6dad2b5ed6c469b2cdc620b7a65e37d8be4be7ec6b6ce6d7753a60
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=the+guide+by+rk+narayan+characters', which is a primary indicator of malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://nipisod.ru/wix?keyword=the+guide+by+rk+narayan+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450034/normal_600acc38d4297.pdfIn PDF document text
    • http://fitotim.iblogger.org/masterbuilt_mps_230s_propane_smoker_assembly.pdfIn PDF document text
    • http://supozupewurak.22web.org/cdc_latent_tb_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_600de71311aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fd7d0a1274f8.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/16fc8b85-dfc7-47c7-aa2e-af69ee73dc87/23298598164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19313f4f-eaa9-45a4-a5df-875e4c47ad50/are_you_my_mother_book_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/runopubinipoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bbb00f-a69f-4cec-bd99-83f7b19e6106/38537474380.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/zezulinerovugisazux.pdfIn PDF document text
    • http://sedepijenokarol.epizy.com/69390687125.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/23085567030.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/mudexegid.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/barrister_parvateesam_telugu_novel_online.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/liftmaster_professional_1_2_hp_manual_open.pdfIn PDF document text
    • http://welidigukiru.epizy.com/93242776195.pdfIn PDF document text
    • http://memunameno.epizy.com/how_much_is_a_generac_22kw_generator_installed.pdfIn PDF document text
    • http://levasufut.rf.gd/sony_str_dh130_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6329ecd8-fbd9-4ae2-8af4-0cf6644ae569/8704427830.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/tchaikovsky_the_seasons_piano_sheet_music.pdfIn PDF document text
    • http://deravamosu.rf.gd/bed_size_guide_ikea.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5424 bytes
SHA-256: f24393e5c2a98c6ea174e77512167202b886e321aa1a3835cbdd68037354a45f
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10032 bytes
SHA-256: 6e5d2e0c574da092539c8ffee0856d45968138ccf315fa1ed532900b60da537f

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