Malicious PDF — malware analysis report

Static analysis result for SHA-256 28445c341c09f656…

MALICIOUS

PDF

78.0 KB Created: 2021-04-06 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 03494ab65dfbb49a0f6cb0082b474b36 SHA-1: 6c540caa9b978b84e7d0f1a4cff1042aa18cc5ab SHA-256: 28445c341c09f656eb1ace81d0aaa482dbe9b5cf1fbf97e1a987b76cbceefc64
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high-confidence ML classifier flagged it as malicious. It also includes a URL that likely leads to a phishing or malware distribution site. The document's content, though heavily obfuscated, appears to be a lure related to legal credit titles, suggesting a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kuzutuzo.ru/strik?utm_term=titulos+de+credito+que+estan+regulados+por+la+ley PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472216/normal_601e29768e191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5fdc32e940bed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_6005e5accf770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5fe1455c0eb87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_60025b92e69f9.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/gj0ifc8/3361562396.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Mhjhdii/train_simulator_pro_2018_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5ff3460596ef1.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/igDifrq/54529565724.pdfIn PDF document text
    • http://good-production17.site/plague_inc_tips_brutalj43zr.pdfIn PDF document text
    • http://compte-cmbretagne.best/63988536408ivgg7.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/01ad4853-b8df-439b-a157-5c96c8a2b492/23015051664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89bc820-86f2-48a9-85ef-09b39e531d12/hp_pavilion_zv5000_drivers_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89e7419-527e-4e47-aef3-bfcaa658fa43/sanford_meisner_on_acting_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ca4eab-384a-403b-9d1e-0209e6ccb247/sirulazikimedevalutob.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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5420 bytes
SHA-256: e35a3b6457b2d7e64a1f77ab054bdaf0156c58656a8e6879b8457673b952229f
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 11580 bytes
SHA-256: 48d217d190d8be18e6e28041c5a1727b2f790287effee2177351e39d3553758b

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