Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44831137c247aba…

MALICIOUS

PDF

81.3 KB Created: 2021-01-01 00:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e6a2484bcd47d829fb466ad80041f146 SHA-1: d0fca6a7d49da0c85af67f0b0f2091192fe0d205 SHA-256: b44831137c247abad4f241af4eadbd643aa2788cc2be47292447e0284ac1fb2c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An external URI heuristic points to a suspicious URL, trafftec.ru, which is likely used to host a malicious payload or phishing content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a crafted lure. No scripts were extracted, but the presence of an embedded URL and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafftec.ru/123?utm_term=life+and+death+twilight+reimagined+pdf PDF link annotation
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/bbf00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fd35100d8595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_5fa002cb9f42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_5fe7041de73c7.pdfIn PDF document text
    • https://fepirajoruvizu.weebly.com/uploads/1/3/4/3/134311883/tabufopitanazo.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/xozeb/wheel_of_time_audiobooks_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c080b1f7-cf26-4d30-93ae-5a95eeb1e5f9/manuzok.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/88596196829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1455cbfd-d585-406d-aa9f-b14de8ffa922/20243823950.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/47942278243.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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 5152 bytes
SHA-256: c815fe065beb3da032343abab175817b94efe4056046841639aed8f4281aad5a
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 4988 bytes
SHA-256: b978fb2e1bac50905709a11f54f192eed7a78ec9acc4cc0c7869c9420c57327c
font_02_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 11200 bytes
SHA-256: 184a7f8b0ac1cc6389add0d3edf0ad1a027fd020f50ba1f3f707b4b2ea5da945
font_03_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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