Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ed89e9af1d0e75…

MALICIOUS

PDF

60.7 KB Created: 2020-11-13 05:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f245ea8fc29d52c046ffb9479cfebb8f SHA-1: 198c6854a2ed8ca3cb96178aba4c3022f05d221f SHA-256: 36ed89e9af1d0e7532aed028eb4e3e15125b1c0af14ef947065ecb91ef4dddc1
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 URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, https://trafftec.ru/aws?utm_term=makita+circular+saw+guide+track, is likely used to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and URL are sufficient to infer a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=makita+circular+saw+guide+track
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5f93796c5cb01.pdf
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fad9a5b04552.pdf
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f88365449f23.pdf
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5fa2d01236dce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35a70980-b7a7-47ad-92be-b07cc347cdca/79620860873.pdf
    • https://s3.amazonaws.com/nonipesikiri/a_basic_english_grammar.pdf
    • https://uploads.strikinglycdn.com/files/811d33ac-74a7-440d-a672-45e16189461c/forum_sinema_saatleri_izmir_hava.pdf
    • https://s3.amazonaws.com/dazifozixawus/7652480112.pdf
    • https://s3.amazonaws.com/pazifetanegapu/72952249203.pdf
    • https://s3.amazonaws.com/wegemebufojafak/mount_olive_men_s_lacrosse_schedule.pdf
    • https://uploads.strikinglycdn.com/files/5564d168-7f7b-45c5-8743-2a3af281629c/dubagubavubarugofupura.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b6.bin
1d3c3c456c814118550d3c5dcc42945661dd56245980be8484760baaebe802a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 5268 bytes
font_01_sfnt_off0000c3cb.bin
237e75d54f5885f95a3bc5db7c4cf45eb7b635e836c0a13a53d060021a5f04be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 10532 bytes

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