Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c9c0d456e58f47…

MALICIOUS

PDF

79.1 KB Created: 2021-04-04 00:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b148298ae3e0a48542d28f02eae1b95e SHA-1: a932453368d1f57eb0fc7112890b986be2e72b0b SHA-256: 81c9c0d456e58f4795151222744d2d74f448a8a8fc5f240f49a78354ecbe6919
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/award?keyword=urban+dictionary+words+pdf PDF link annotation
    • https://cdn.sqhk.co/mixaluwekitu/jeJidTT/bottle_cap_flip_challenge_game_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/kAHwb9U/mazidojaxaniwujozezi.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/ii3K1Jd/fajedebevasuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/ggjugih/wololo_age_of_empires_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/gi2ighf/disc_bulge_bowling.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxopejitin/jieicii/langrisser_i_ii_switch_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/fVbjiK4/romancing_saga_2_vs_3.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/chfv8fd/hide_and_seek_maps_fortnite_codes_mansion.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/hohaGyy/monaxuremibuguvapilozib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/what_are_the_symbols_of_the_chinese_new_year.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/heaven_is_for_real_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/turco_plantation_kerosene_heater_manual.pdfIn PDF document text
    • http://zilajib.epizy.com/fernando_pessoa_o_livro_do_desassossego.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_dc3cef45a27046349b8479cf468ef00e.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_71270d2c7a974dc9a0c72a7c9519f73a.pdf?index=trueIn PDF document text
    • https://5121d360-3808-4f61-aa44-d87cf2d9d428.filesusr.com/ugd/032e8a_58e183d997b94a2f8397292b08f4c465.pdf?index=trueIn PDF document text
    • http://nexaware.epizy.com/fupulaza.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/how_to_fix_a_kenmore_refrigerator_ice_dispenser.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/93562504826.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/is_there_going_to_be_a_sequel_to_5th_wave.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/vorurigamefozowixesilezeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/best_kennedy_center_honors_performances.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/surah_kahf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5112 bytes
SHA-256: 2eb32a82f7cd56d321aa58bc08adc694d9e6d76c1cdbd4f17f2da63fc370b391
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 11136 bytes
SHA-256: 45ff1987c9bfeaa03a6da8f1c7b0e9da3245db4a20788d8cb1cd13faa058af13
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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