Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a0973714eb2f38…

MALICIOUS

PDF

80.9 KB Created: 2021-02-19 23:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c92fb48ff3f6fb049a818bc774b48cdb SHA-1: f16f11466c7a7d49f7d2ad5ec63557836c504677 SHA-256: 51a0973714eb2f387dc704203e120dfd450ca47d179ce7664ccc55ed6d105d7b
126 Risk Score

Malware Insights

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

The PDF file contains a lure related to Costa Rican volcanoes, directing the user to a suspicious URL. The PDF is identified as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=what+is+the+best+volcano+to+see+in+costa+rica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454420/normal_601146c816580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424010/normal_6002f81cdb95b.pdfIn PDF document text
    • http://sidazolomaw.22web.org/dunajonujikebefogoguga.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/U21eaVN/map_of_hypixel_skyblock_hub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_601628f7bc381.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/59006953411.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/xI3imjc/ages_of_history_of_english_literature.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/j0hfMha/tufir.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/giEjdxs/90786281178.pdfIn PDF document text
    • http://jonoxosu.iblogger.org/avast_cleanup_premium_crack_2018.pdfIn PDF document text
    • http://lodujenoxo.iblogger.org/cg_police_si_notification_2018.pdfIn PDF document text
    • https://bevarari.weebly.com/uploads/1/3/0/7/130740456/f17a740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fcebea790827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevedikelu.epizy.com/commercial_kitchen_vinyl_sheet_flooring.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/mp4_video_song_website.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/rememikatujuwa.pdfIn PDF document text
    • http://burabovedi.rf.gd/carb_cycle_for_fat_loss.pdfIn PDF document text
    • http://gubadix.epizy.com/lorokutis.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_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 5100 bytes
SHA-256: 6213a70e20aae222ae4d36c7bf255bfca2f3a7334126ef84ec5468e65971b5e3
font_01_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 11316 bytes
SHA-256: 2cda5064740d69add0824897ec1020c1264704796eb7b29644d121d57de858ce

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