Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1b5de3f09938de…

MALICIOUS

PDF

92.4 KB Created: 2021-02-28 17:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a39d15255564fedc2b9c7318e46ad6a2 SHA-1: 67dd966bed71de332b348231059ac68b0447e2d3 SHA-256: bd1b5de3f09938decdbc7a31aa93eedfb6c341a719cb8883224148af7e6e4a64
136 Risk Score

Malware Insights

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

The PDF contains an invisible link that directs users to a suspicious domain, likely to trick them into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/wix?keyword=geometry+chapter+8+test PDF link annotation
    • http://securityofusersdevicesonline.site/car_rally_crash_stevenagenw3gh.pdfIn PDF document text
    • https://cdn.sqhk.co/malakizojaji/jgjgLia/dekinisusalanakoke.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/b8cc2b0c.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/7uHidpI/hicarer_clock_movement.pdfIn PDF document text
    • http://policyhelpcenter.com/dawn_of_the_robots_ielts_reading_answersnj8bc.pdfIn PDF document text
    • http://gozatelaji.22web.org/kmspico_windows_10_activator_2019_free_download.pdfIn PDF document text
    • http://love-cosmetics.shop/13169798028ge5on.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/bomupi/astronomie_dbutant.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/ofac_countries_list_2017.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/dublin_breeches_size_guide.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/free_avg_tuneup_2015_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/aiou_b._ed_online_admission_form.pdfIn PDF document text
    • http://digifasofow.rf.gd/lavizapurazarowud.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/tarilexedoxukoreminogux.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/mebasux.pdfIn PDF document text
    • http://bagurofodi.epizy.com/eular_guidelines_large_vessel_vasculitis.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/bams_4th_year_syllabus.pdfIn PDF document text
    • http://pojinagogaj.rf.gd/b._ed_haryana_online_form_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 5468 bytes
SHA-256: 9f335c74157e14db166f537a4b37862407847b5abfcf3fd8947ac706b0ecb1b8
font_01_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 10732 bytes
SHA-256: 15b85ae7dae9938f824bb242e5a1da5458192f1118193c3065206ff3868ad071
font_02_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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