Malicious PDF — malware analysis report

Static analysis result for SHA-256 991b1561a9798802…

MALICIOUS

PDF

75.1 KB Created: 2021-03-30 17:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a5d6426e69f164f9e644740d7c01056a SHA-1: a580f23ce0bbf8a193551a032e797a29705a8f8f SHA-256: 991b1561a9798802aa046a101b106aa5a0c8474ea368f0a22d80d4cdb3cb03c0
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is presented as a download for 'fluent forever pdf'. This suggests a phishing or scam lure to direct users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=fluent+forever+pdf PDF link annotation
    • https://cdn.sqhk.co/penunotati/kxBQDja/secret_agent_action_movies_list.pdfIn PDF document text
    • http://arenda-comp.space/107302928161rtop.pdfIn PDF document text
    • http://allrecipes.pro/download_2048_cards_merge_solitaire_modfa7fo.pdfIn PDF document text
    • http://e-devletodeme.net/vebuminidemjblo8.pdfIn PDF document text
    • http://simcars.ru/pudozonilexozediko3gcos.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/cjiific/jajonodimaxabo.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/jd2jejj/26158832801.pdfIn PDF document text
    • https://cdn.sqhk.co/wenavuso/3rLicCv/56275924798.pdfIn PDF document text
    • https://cdn.sqhk.co/kipafipigifi/iiSiaAP/shark_tank_full_episodes_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/ggdR2RR/86568705560.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Aggjdie/onedrive_for_business_download_folder.pdfIn PDF document text
    • http://galoomer.online/how_to_fix_printhead_hp_68300sxwe.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/ifhgigh/69223353647.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/penale/angielski_dla_pocztkujcych.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdcc5f1-25b3-4f2f-aaea-07b59c290c52/xesazedizamo.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/twitter_video_er_app_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a0143e-c8a5-4f1b-a597-c509b6e37d84/nabazivusul.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/average_and_upload_speed_in_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc8d986-e3a3-4390-b54a-8faeb77f0df1/resumen_del_libro_tus_zonas_erroneas_capitulo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/what_foods_are_really_high_in_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9ef3c6-dffb-4f2d-9980-09753519534d/gefokujawogekosinifulenak.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/anglies_monoksidas_chemin_formul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200daff0-9532-492b-8681-16941d6e1aaa/76968034638.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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 4664 bytes
SHA-256: 06e35d314d22c1e204638efb1b6ef4c3e48a9f33870aa7de44adc4e45cc709b8
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10504 bytes
SHA-256: 294e182d94b2b289b5965370f86811c3ee84618f1e5a269ea5d59e0408f30955

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