Malicious PDF — malware analysis report

Static analysis result for SHA-256 691c3cf5d10e78fb…

MALICIOUS

PDF

93.1 KB Created: 2021-02-14 01:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 734fb0a8df63535b80f8f33624f7f7e2 SHA-1: 2ef9a924404f21b6cc057f1662c18d1646d00cb8 SHA-256: 691c3cf5d10e78fbe6dfbde0276a199c619179c2fa6a62f9b3e6de90f24491bf
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://baarspo.ru/123?utm_term=universal+crafting+station+terraria', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated by a tool rather than being a legitimate document. No scripts were extracted, but the presence of external URLs and the high confidence score indicate a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=universal+crafting+station+terraria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448328/normal_6013140f2846b.pdfIn PDF document text
    • http://rewuvov.iblogger.org/ielts_reading_practice_2018_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/zieijI1/28182041637.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/8rFeUdP/watch_pulling_online_season_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_5fd7b83c7ab09.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/HtibhiO/gotefafadovevogupowow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5fe55e46a7df5.pdfIn PDF document text
    • http://jemaxawiju.22web.org/alerta_sismica_df_premium_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd67265717c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5fcd6782129d0.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/ifCjby6/gelikowoputodoruxaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469831/normal_5ff58a71791ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fe31472533c2.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/jowutoneranemuk/engineering_project_sample_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/princeton_review_mcat_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/enter_the_gungeon_items_guide.pdfIn PDF document text
    • http://supegawezokex.epizy.com/latest_couple_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/26112545770.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/27620347428.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/can_t_believe_her_music.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_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 4888 bytes
SHA-256: 9d53b1f157eac924a1b965af6be301aeba9df05c8dc7b3403354824f2a44f5cf
font_01_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 13008 bytes
SHA-256: 39685d06c58cf7865a0fddfbe26ff036311b97d84805b35f557a4f640d9d4901
font_02_sfnt_off0001588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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