Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7170d7fb3b96e51…

MALICIOUS

PDF

75.9 KB Created: 2021-05-26 07:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 11e4428539e066054325ab9a592dcba1 SHA-1: 2a8ccf4960912d5d1b11f6873e21bdb93e90e828 SHA-256: b7170d7fb3b96e517df981d65cafb8597ce769c0db8772763397d837dbfa7403
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious URL. Heuristics indicate the presence of external URIs and a high likelihood of maliciousness based on ML classification and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to performance reviews, which is consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+write+own+performance+review%252Fexamples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461216/normal_605500259bac6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5ffbe3dfad4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_6044919ead50d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_6021922fa9664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5fc5c7b0c662d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_6006ef133e3b4.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/46fe4e0f-10ef-4582-a619-f4c192a705fb/dead_wake_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/que_es_comunicacion_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/xivubupinimadokej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace9d572-06d4-4ec6-b0b1-d1901b948bf4/58549989519.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/jaxadetekirugimifugefape.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/21951673999.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/15819754757.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/70572447875.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/mobesupizuwetana.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/how_much_oil_do_you_need_for_butterball_xl_turkey_fryer.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/34035178698.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/89050712357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fab008-48b7-49fa-a519-34a19a2e5350/multiplying_and_dividing_fractions_worksheets_with_answers.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5380 bytes
SHA-256: 0ba14c592bb65a01e65023797eef3af8905f04cce7e8a3bc2544795cff3fb1e4
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 10064 bytes
SHA-256: 8ed58eeb9873ab71a36d2578d7fd3f9babe399b52683e5fcaa3eaa010e8756e5

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