Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c184d50e70393bc…

MALICIOUS

PDF

89.2 KB Created: 2021-02-10 14:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 940ef569949561ae468b2f721d3604b1 SHA-1: c36d51da461018671328132ee6e58c489b2cb517 SHA-256: 4c184d50e70393bc1733072c229e1c51cea290a8486be14262253c17041ffde2
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://baarspo.ru/123?utm_term=online+graphic+organizers+free+interactive', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=online+graphic+organizers+free+interactive PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412391/normal_5ff901de2a7c4.pdfIn PDF document text
    • http://topchambre.xyz/anyway_you_can_annette_bosworthaaf13.pdfIn PDF document text
    • http://creditscoretracking.info/72744230131lartp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fe90fbf6bcc1.pdfIn PDF document text
    • http://votadunepit.22web.org/expedicion_de_certificado_medico_falso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_601ed6773085b.pdfIn PDF document text
    • http://itawegan.fun/eu4_protestant_center_of_reformation_cheatib9vk.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/lorifawuvawot/packers_vs_bears_prediction_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/45872742769.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/jazemorimanili.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/horse_racing_games_free_android.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/nefurojovomoliguzavebi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 5200 bytes
SHA-256: 97d271cfc353af06501956fdb824d7e6850f445a8735d2150bd409ab23cf2cfe
font_01_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 10884 bytes
SHA-256: 26d75b4cb787fd4745aaa1d02324e088bfea50a67142e6c1383968a08eabfbbe
font_02_sfnt_off00014976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14976 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c