Malicious PDF — malware analysis report

Static analysis result for SHA-256 385c7fbb30466b47…

MALICIOUS

PDF

74.3 KB Created: 2021-02-18 00:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ba921102241519800d2f1ed08468790f SHA-1: 43823a8f9755b1519869f31a84aa9dec751614b9 SHA-256: 385c7fbb30466b4771b4c5782fb6211b87c218f31441289fa956216ae81e0da7
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://baarspo.ru/strik?utm_term=respironics+remstar+auto+c-flex+manual', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a product name, which could be used as a lure. No scripts were extracted, but the presence of external URLs and the high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=respironics+remstar+auto+c-flex+manual PDF link annotation
    • https://cdn.sqhk.co/pedidagow/idDyHYz/72753200871.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/impihUW/brain_training_games_online_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/heIjitt/hand_held_drill_press_stand.pdfIn PDF document text
    • http://simcars.ru/57551102129e84ku.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/iijgjjJ/barber_hair_salon_hair_styling_games_3d_online.pdfIn PDF document text
    • http://bellissimo.online/royal_mail_international_business_parcels_rate_card_2020e6x7l.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodabatot/m1jcYuK/78318901939.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/idhcieH/fall_guys_unblocked_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcbf71640981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5ff05c447e5de.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/egjKih7/fogideteluvako.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/g1hQ3gg/class_dojo_app_instructions_for_parents.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/xuxifuzituwu/pejudatubiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/android_version_list.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/ielts_material_speaking_part_1_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/lightning_returns_walkthrough_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/5566425986.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/information_on_ancient_means_of_communication.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5268 bytes
SHA-256: 897d5362eed507e5dc1924dab6cf818aeeef90d6bc1e8c0534d0f4d81b5654f9
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 11152 bytes
SHA-256: 1c77b7337b66ff63cc009cb0bc1445b491d0b49bb4ad2aecd6839cc38609b291

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