Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcbfe3f292c6959…

MALICIOUS

PDF

77.9 KB Created: 2021-05-30 22:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6998bb1ad1fc8df18901bb93b44a7376 SHA-1: 28abfddf8a067aa007f6ccbbeb69ec6ac1d1cf11 SHA-256: 3fcbfe3f292c69592245dc8cc665eb084aeb3b432455b3ce28e663393415ad45
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/strik', which is likely a lure for users to download further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific purpose beyond the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=album+songs+tamil+free+download+mp4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459025/normal_600752de7f150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fe85866757e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460076/normal_5febb0358faea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fe6c2d090731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_606bf1694615b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_605a2e31cdf8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_602985c7dd313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5ff867eded744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd637eeda912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_60486b01a1633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_606e814c59515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_602d490434b10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_6062651814fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_60472ecc18e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_603b7a01b4549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_6031dd78c4ac3.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/44c7a055-8bec-4217-8c28-69b4fbd2ff3f/comfort_aire_dehumidifier_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea02d6ca-fa76-4af0-bc39-78e03b6c1d7b/47174706853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28a4971-48bc-4b13-ab36-1b69119df004/kimuxelovit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc1ea77-01b0-4797-85c1-5d1d60865bb6/7081894085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed006ace-8040-4be3-bb78-42a288b74032/5659727684.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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5672 bytes
SHA-256: 8750c7ee17c1fbcdc21c6f19fae909400d1ea43219f1790a68e9baccbb27b2de
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10624 bytes
SHA-256: c71895013db22ac031aa4cadc6c5fdc8b0bff1fba2721a87e0a8f525d7a9a26a