Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf57a86bfeec5f64…

MALICIOUS

PDF

74.3 KB Created: 2021-02-20 09:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8b8f11f9b4dbda6f8bc56880460d5af2 SHA-1: a10571082b905af8950a6f9f443bb85804a2a23b SHA-256: cf57a86bfeec5f64177c7fd66491c822b318d27aeb17c3ec0261e85957b0c2bc
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL `https://jacksth.ru/wb?keyword=learn%20chinese%20book%20reddit` suggests a phishing or scam attempt, aiming to redirect the user to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wb?keyword=learn%20chinese%20book%20reddit PDF link annotation
    • https://cdn.sqhk.co/nanijamu/iaNuxhi/58778980739.pdfIn PDF document text
    • http://swiss-gear-top.xyz/dell_poweredge_r710_server_datasheetxwpmb.pdfIn PDF document text
    • http://power-guard.shop/acquired_brain_injury_ireland_referral_form8przb.pdfIn PDF document text
    • http://clipshd.design/sphinx_and_the_cursed_mummy_walkthroughuv18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_601ca1ddc3ab1.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/Vljfheq/voodoo_boombox_prix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_5fff3b593448d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fc9288fd673b.pdfIn PDF document text
    • https://cdn.sqhk.co/jixasamo/dhfhhEN/messages_app_download_for_windows_10.pdfIn PDF document text
    • http://manthoughtswebsite.website/motorola_cp200d_battery_chargerrlz6v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/runuzitexokol/51382640664.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/allotropes_of_tin.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/jutimorikufutonidilolanet.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/china_visa_application_form_for_bangladeshi_citizen.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/formal_email_apply_job.pdfIn PDF document text
    • http://dofurorumilu.epizy.com/peronirizijimaruj.pdfIn PDF document text
    • http://gijomifede.rf.gd/53210610991.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 3112 bytes
SHA-256: 5b322faff6e550ac23befcd1d53da02e7fd18482b572ce87cf93e66651944b50
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 4928 bytes
SHA-256: 880c7cee91dcae024124e88517e4b4a18bc6bfc471d1579215f7c9ba09122208
font_02_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 10584 bytes
SHA-256: 8716478ee3e2a405beef2c2d3bdd08bac574d71b76a34cfba4fbb5b8dbbc598c
font_03_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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