Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d719e7871b81f2…

MALICIOUS

PDF

146.7 KB Created: 2021-03-13 21:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fe2d08a8dd42cb8bddbdcde00254a35a SHA-1: ed7246f9e06930bcf5789497997ff7f54c96d763 SHA-256: 81d719e7871b81f27bee4e6cf03f3ff18bb12c311f8bd12ceac0b297f2b626dc
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=absceso+periapical+y+periodontal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450356/normal_600a5f4d3f2c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fca988195231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454665/normal_6002bf680aeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480170/normal_5fede4382464e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6013790b22b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5ff64ffebe932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369919/normal_60032187d86f7.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/36d8bfbe-0129-4fd2-839a-fd42fe972427/lokolarofipeturawoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee801fcb-ca1f-4e67-a3c2-c164ca7ef6b9/67138229469.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_ead340bfbdd1439ab1292e9e823fa9b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74d3fd2-7ddf-4607-9ad6-c53f4fae2f73/the_girl_with_the_dragon_tattoo_series_swedish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d7574c-a7ea-4d6e-95a2-e2dea0410159/mugapejafozid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c39504-6c85-4d6c-ba97-b200e2a1916e/vojoja.pdfIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_2f41259fdda8443999d5eb7c8a922484.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c0b487-fd9d-4ce9-afc4-d190a5480743/snapper_1030_snowblower_parts_diagram.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_off0001fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEA5 5380 bytes
SHA-256: bc35884c0bd72d70f8a667e52736fb79e399489a0159aefbabb75dcf77e9125f
font_01_sfnt_off00021104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21104 12928 bytes
SHA-256: f0b623e8debab0ec19d1308c7beeb94124781d0e8672d43eb4808fe4f66bb8e0

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