Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26fa66f388c58a4…

MALICIOUS

PDF

74.7 KB Created: 2021-01-01 04:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9f6cc675bac1d1dae0a8759aab26c9dd SHA-1: ee122133b365de2fe6fecebaa3e7054d7ade366f SHA-256: d26fa66f388c58a414d584f07100cfa4f0d80401f1a5f0734bd8c912b12695c0
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely intended to trick the user into visiting a malicious website. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the presence of an external URI in a PDF with a high malicious score suggests an attempt to download or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=terraria+calamity+mod+guns PDF link annotation
    • https://cdn.sqhk.co/dozumapufa/b43QhdB/96142975233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_5f9c7661df27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5f9cc1661b2f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5fc4d9f20d378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5fa85f5a4d1a3.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/1aef92df-9ef5-4725-bed8-ec7669fb16a1/vajomizez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942d2241-f95c-4a17-92c8-8fd79373053a/lumusugozel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9792b805-f926-4eeb-88b2-a6ee149befe0/kinaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b793e8d5-ecc1-439b-88d3-b367246e275b/referajudokexagal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c70e8f-89d4-4625-8dea-0078c1366383/35828845482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114eb9c0-0451-4147-909d-0ae1e6750f80/segment_addition_postulate_answers.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 5308 bytes
SHA-256: f1950f2cb61bcd1ddd7524937a8fa5a48dbae2d6ede0eabd79b6cb246ff30156
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10952 bytes
SHA-256: ed81489d4e0c3927393837e16454002046b157c556394e7ad944038f6b38a37f