Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e88b060cce1a766…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 03:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8805517e2d80ffc24dddda362f27a3a7 SHA-1: 26967168265eb246761a665f6a454c992fcecdd3 SHA-256: 3e88b060cce1a766671eeb103944a6e9f5826cc5822f11828fea4295830ddeb5
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://xajibur.ru/strik?utm_term=kant+critique+of+pure+reason+google+books', which is likely the malicious landing page. The document body is heavily obfuscated, but the presence of the external URI and the malware detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=kant+critique+of+pure+reason+google+books PDF link annotation
    • http://1cats.space/mobile_charger_circuit_diagrame7in4.pdfIn PDF document text
    • http://axecheat8.xyz/72262029725e47u9.pdfIn PDF document text
    • http://roskycnmx.com/zentangle_feather_patterns_step_by_stepv8run.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigonusotomofi.rf.gd/fundamentos_filosficos_del_curriculum_en_el_contexto_de_la_educacin_especial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2949b3da-7cc2-4148-9065-27d5c8f12469/how_to_set_up_blizzard_authenticator_serial_number.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/57616344912.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/amandine_du_38_reportage_66_minute.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/29905021586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fe7aca-ef33-4071-85c0-35b72863691c/29410398481.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/citra_android_latest_apk.pdfIn PDF document text
    • http://pupuwejerew.epizy.com/sodinujujemamiraseserari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005b8e28-25a1-496b-9589-236b2bf49123/33626692081.pdfIn PDF document text
    • http://najorenowodume.epizy.com/ennum_ennum_azhakarnnu_viriyunna_album_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/acidosis_vs_alkalosis_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/death_note_anime_light_and_misa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c883f6b-68a0-448b-a004-757b312d822b/john_grisham_novels.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/bailamos_english_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/suzova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b04b6d-d605-4611-b319-a3f8b7093496/how_much_is_a_rheem_solar_hot_water_system.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/myers_psychology_for_ap_3rd_edition_slader.pdfIn PDF document text
    • http://rekalira.rf.gd/the_courage_to_be_disliked_kindle.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 5480 bytes
SHA-256: 55b333092eab4bcbbf8927fd9ccdadc9ec4ca73d9c33f746e2824bf254c5a4dc
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 9988 bytes
SHA-256: af03fa62e8f82c52c6e87f8b88698a10039c0e038ddd44ea47919a8584918dfa

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