Malicious PDF — malware analysis report

Static analysis result for SHA-256 b151a9debb1d7e7d…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 20:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 25e22db7aa30af66d36c245e8ac58d90 SHA-1: 9eb00e5f5ae7f596f61852ab7dbe4c5b4304eb3f SHA-256: b151a9debb1d7e7db1962bef7d2714735e9b78f52c756e9a3c3f1addbef48363
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL, https://jacksth.ru/wix?keyword=tertiary+carbon+sn2, which is likely used to redirect the user to a phishing site or download further malicious content. The presence of PDF-specific heuristics and the overall detection score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=tertiary+carbon+sn2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6019c5d8d61db.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/Eidgg1h/63379296542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fd7a0b8c8904.pdfIn PDF document text
    • http://natezaka.iblogger.org/lg_g7_thinq_aggiornamento_android_q.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoweva/gjhrBLC/74508375997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6011fc77b4b41.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/VggUuja/85253080366.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/5136715.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/ze5Qhbx/reading_eggs_learn_to_read_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/g5ggFo1/cosmo_and_wanda_halloween_costume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fc7cce4d6d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_601e1a9a66b60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5feb78818fb7c.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/hfZigie/82364986559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 5084 bytes
SHA-256: 8a4ab0f5dc2060775c29ddf7e8760359c7bc346442d47989a4951cb429120f36
font_01_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 10576 bytes
SHA-256: 2a7c3996aa89761be01155178d98cd0f76b72de076104ae35e2004174d415444