Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc2fff45c873237…

MALICIOUS

PDF

81.5 KB Created: 2021-04-04 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f16d98e7d6b1a6c38f7817f7e122cdf SHA-1: 622b3d6c9984e1dd033c77ac5e56b45e260fb8f5 SHA-256: 3dc2fff45c873237a69fdc1aa9799f21f9a41f4fbc8cf668c1a9351dc0091e14
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains multiple embedded URLs, one of which, 'https://nipisod.ru/award?keyword=generos+literarios+clasificacion+pdf', is directly referenced by a heuristic. The document body, though heavily obfuscated, contains strings related to 'wkhtmltopdf' and the URL keyword, suggesting a lure. No scripts were extracted, but the presence of external URIs and the malware detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/award?keyword=generos+literarios+clasificacion+pdf PDF link annotation
    • http://top-shop-store.website/electrolux_air_conditioner_remote_guide6o67q.pdfIn PDF document text
    • http://blaugrana.ru/can_i_share_a_on_a_facebook_pageadtev.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/4jchbr8/zoweta.pdfIn PDF document text
    • http://servisvds.ru/ryobi_bts10_blade_guardoh0m1.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/interior_angles_worksheet_answersbk323.pdfIn PDF document text
    • http://razvivatel.blog/asset_management_process_flow5m3kq.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jihithc/99550563233.pdfIn PDF document text
    • http://003-center.ru/livre_guide_touristique_namibief4vee.pdfIn PDF document text
    • http://dalnoboyi.xyz/michael_pollans_food_rules7gj2a.pdfIn PDF document text
    • http://reduslimitalia-official.site/pete_the_cat_and_his_4_groovy_buttons_printablesxjr9q.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/chjLJAG/gerabutifox.pdfIn PDF document text
    • http://storergoods.site/whats_a_good_300m_hurdle_time7wggw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/broken_but_beautiful_web_series_song.pdfIn PDF document text
    • http://pevixogojo.epizy.com/93570615709.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/69804532073.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/87961755349.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/76833040311.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/35045945964.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/14224684441.pdfIn PDF document text
    • http://gebutetivifupa.epizy.com/bacterial_culture_lab_report.pdfIn PDF document text
    • http://dudameridetira.epizy.com/parkour_training_center_near_me.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5180 bytes
SHA-256: 24f4b8b4327b003245eb5579854465e7648e64a04aa2a6ad17dda66f19810a3b
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10744 bytes
SHA-256: 3ea0c3000b67205e1c66b93bc9497990c84be091ff666ee1a6f76d81533f90db
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16632 bytes
SHA-256: 7ed423fd6f64a2accaab24a388a557cab9318e50e2ef4475c53ca1e35efe0f17

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