Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50cb20005846e90…

MALICIOUS

PDF

67.9 KB Created: 2021-03-10 22:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e2f23b0d7adfad63225db277e75ef11 SHA-1: d9c4bcf09555e949af2b0718f4b62c548e117587 SHA-256: a50cb20005846e90c1542df408ade64f1469fe3b384ae1d4acd900bfe8bb0952
96 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs, one of which is flagged as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs suggests the document is designed to redirect users to malicious sites or download further payloads.

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://crophysi.ru/123?utm_term=zipgrade+answer+sheet+30+items
    • http://liketime.online/ctspak_answer_keydc8jh.pdf
    • https://cdn.sqhk.co/tizudukokeni/RXBjhin/stickman_soccer_2014_download_apk.pdf
    • http://kellys.space/pesuzetepawefawewogajdbi2.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f95d3c049.pdf
    • https://cdn-cms.f-static.net/uploads/4446029/normal_603e1859ed7a0.pdf
    • https://cdn.sqhk.co/duzefodaf/djbTgd7/gametv_plus_cho_win_10.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_602e81965ff87.pdf
    • https://cdn.sqhk.co/wuvakumo/hhrjihc/75856756255.pdf
    • https://cdn-cms.f-static.net/uploads/4415934/normal_600dd1e449cf5.pdf
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6047d7d106f0c.pdf
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5fe3c37768a2c.pdf
    • http://vpntop.info/factoring_squares_and_cubes_worksheet25q3o.pdf
    • https://cdn.sqhk.co/digubamot/2ififjc/mugunitimanufozeworevomu.pdf
    • https://cdn-cms.f-static.net/uploads/4450428/normal_6046539014a55.pdf
    • https://cdn-cms.f-static.net/uploads/4476015/normal_602d03c527e52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bededuxotulapil/ftse_all_share_index_performance.pdf
    • https://s3.amazonaws.com/sivanira/the_cultures_of_the_west_a_history_volume_2_download_free.pdf
    • https://uploads.strikinglycdn.com/files/56afa9bf-6e04-48f0-be48-5438861dfeac/the_masque_of_the_red_death_characters_represent.pdf
    • https://uploads.strikinglycdn.com/files/657639fe-fb78-48be-9a80-293c4fb0fe38/vewisigurolosovaki.pdf
    • https://s3.amazonaws.com/gofiguj/brother_cs6000i_bobbin_winding.pdf
    • https://uploads.strikinglycdn.com/files/da1cb6f9-4270-4765-851e-756a8fb166ad/mental_toughness_questionnaire_online.pdf
    • https://uploads.strikinglycdn.com/files/f247a5b5-6512-41b4-9729-30b960b8707e/bowflex_xtreme_2_chest_workouts.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_off0000cc20.bin
907c1eddb473273bd512cbc2473e6cb1e97f2d379a6b5a1db69d106c87931f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 5696 bytes
font_01_sfnt_off0000df6c.bin
232c47da81b507d2c9a611ae9b31cce5cfb9e1f7d45e86370171de533a9a777e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10304 bytes

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