Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae199ac269bedf51…

MALICIOUS

PDF

79.0 KB Created: 2021-03-11 15:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3122e1ce8d4581f57ddc618920ddae17 SHA-1: d6787caacc38c1d841e1e39d96e106ae0583bf05 SHA-256: ae199ac269bedf51ab97683c4c4d47c4136f33fd37242847203ebdc1a712676c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to 'jacksth.ru', which is flagged as suspicious. The document body, though heavily obfuscated, suggests a lure related to 'curso de ingles para niños pdf' (English course for children PDF). This combination strongly indicates a phishing attempt or a redirect to a malicious site designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=curso+de+ingles+para+ni%25C3%25B1os+pdf PDF link annotation
    • http://nomokesus.sportsontheweb.net/heart_of_darkness_sparknotes_summary_part_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fc71e2526a18.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/how_to_pair_roku_streaming_stick_plus_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_60267ca1e188f.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/can_you_break_a_lease_in_indiana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5fd7a3dee910a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_601aba8c37854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_603e9626adaf3.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://uploads.strikinglycdn.com/files/88321117-743d-4097-98e8-1de79c649f3e/the_motorcycle_diaries_movie_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/vetisufa.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/mazifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229a3d64-1b7b-4167-91bc-8411838bb5bd/77739992763.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/your_amazon_music_has_expired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c621a807-b4f0-4d5d-8a1d-e44f369d7be2/are_ryobi_mitre_saws_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a96189d-504b-4c57-a134-2ff548d3ac55/zepukowopuwesosikojifos.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/what_is_the_story_of_the_shack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055ff7ed-209d-4a07-adb3-7ef6f61d15e3/is_forged_in_fire_on_netflix_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/165703680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f73d56f-c11a-4d20-a376-ac3e1390fbdf/john_deere_tractor_mobile_repair_service_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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 5244 bytes
SHA-256: 8f02e822ed047a247daef572e73597da7dcbfee1b2a421de1b6c6bb09fc8a854
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 11196 bytes
SHA-256: 959e2c37275c268506150306fd83a9d1133dddd235f3f11b02f1d0b94c2bffc5
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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