Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcc68c010f5db83…

MALICIOUS

PDF

73.0 KB Created: 2021-04-16 19:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab2204b761c13bc12aa83057531d134 SHA-1: 5f5a96c332fa45877c9edffd46eed0ba130be31e SHA-256: 9dcc68c010f5db83706a53ffff50015ac00f14903f62a7954a9fa9fed0dee2d5
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book search, suggesting a social engineering tactic to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=elementary+linear+algebra+howard+anton+8th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fda8d4dd56d3.pdf
    • https://cdn.sqhk.co/zumumolebajo/bicidg1/22340440513.pdf
    • https://cdn.sqhk.co/girolivudafo/fNSgcid/pigemasoja.pdf
    • https://cdn-cms.f-static.net/uploads/4502833/normal_602733dcb2cd5.pdf
    • https://cdn.sqhk.co/bulixanejad/4hijeL8/hacker_prank_simulator_app_download_for_pc.pdf
    • https://cdn.sqhk.co/fiwujumejuf/mhdijRu/warcraft_3_reforged_female_heroes.pdf
    • https://cdn.sqhk.co/sotogademo/gf7Lgib/mini_golf_scorecard_online.pdf
    • https://cdn-cms.f-static.net/uploads/4485012/normal_6014714b755a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lowojosixomab.rf.gd/maternity_leave_letter_sample.pdf
    • https://s3.amazonaws.com/gapuruxumeg/dakobirekebigafada.pdf
    • https://s3.amazonaws.com/datarofapakil/crosley_cruiser_sand_velvet_bluetooth_record_player_review.pdf
    • https://uploads.strikinglycdn.com/files/9c6a0cc7-098a-40dd-a9db-2fbd72e847d2/teachings_of_the_prophet_joseph_smith_sel._joseph_fielding_smith.pdf
    • https://uploads.strikinglycdn.com/files/d113c616-7418-44b0-8566-5d05c2e19fbe/brother_printer_mfc-490cw_unable_to_clean_46.pdf
    • http://zuvetimimu.rf.gd/pelaleguxul.pdf
    • https://s3.amazonaws.com/baposivarabuj/gikibizoninetaturolit.pdf
    • https://uploads.strikinglycdn.com/files/97fd9a0c-5c5c-482d-b19a-267f0f20ba9d/cuanto_es_6_1_pulgadas_en_centimetros.pdf
    • https://uploads.strikinglycdn.com/files/4b9dead1-cb18-4e50-8ffb-ed0c8cdb4567/5347643982.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78b.bin
e2939db16c2e841849592cc282766d49f27ab504192f4588098fb344789600e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 5760 bytes
font_01_sfnt_off0000db10.bin
01c2632a3608a4a8b33fe1215375299c4e5a61d32e5f23d27a7f632d7cda03f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 10500 bytes
font_02_sfnt_off0000ff52.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16204 bytes

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