Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dacd9d4b15fc9a…

MALICIOUS

PDF

82.6 KB Created: 2021-04-30 20:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f782cc487210bf91ebed90a362ac868a SHA-1: 4bb1edb2d0e4a37be86a1ab1b6dfa949789f679c SHA-256: 25dacd9d4b15fc9a9560e9e28ea1069b3cca18fc2b3ebb04a7af758c3393cb97
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'free online drawing classes', likely a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=free+online+drawing+classes+for+beginners+youtube PDF link annotation
    • https://cdn.sqhk.co/jigitovewuk/HHoQxgg/79043488111.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/fhiigii/mularifofisetiwelerozafo.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/0hghe0q/cartoon_network_schedule_usa_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/grgcsih/lesujoxinotog.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/izRTzij/ladis.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/eib3gjs/vikings_game_score_last_night.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/HhjhhXr/cinemark_theater_monaca_pa_showtimes.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/amcjcPL/39159037270.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/efvDjfZ/ink_master_host_fired.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/Mhcdhc4/trending_hashtags_2020_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/26gjAhi/senadezafifusugujusolide.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/yijIxhf/importance_of_ecological_succession.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37563e7b-8f01-417e-a027-2aaacd51f0a7/baby_girl_nike_shoes_size_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fdf5b0-de86-433d-813b-6d9f7c5bc7c3/the_master_key_to_riches_summary.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_5d8a88d31ccb4bbd950053167b67a2ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bfd8bb-4c18-4224-97d2-ad41fb76a5d8/neil_degrasse_tyson_universe_netflix.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_7b99edc4e12e47bf8864d0159b135df2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29823e6-a889-4614-9567-e959dbbe6302/55421479876.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_5a8ed8ca42a84d459234b61ea1847879.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03bb16e-931b-4551-a618-3b48b7453e5c/68785049131.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_587a617bd65d4d5a98745ff40d32b48f.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_d21ccb8f250f4e0a8141c9c3d0c3af79.pdf?index=trueIn 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_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 5476 bytes
SHA-256: e586837e786f8f198524cfe07c41fdef5fee051ae62cd0edff2d2302c6a252c0
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 10736 bytes
SHA-256: b902a7951c739ec34a640f6305f933bead4a92412e1967192bc92e251e3de8e5

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