Malicious PDF — malware analysis report

Static analysis result for SHA-256 8519e7862459f1d5…

MALICIOUS

PDF

62.5 KB Created: 2020-11-22 00:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ec28fabdc614457d2cecaeaf64fcde81 SHA-1: 70db4e76fa3bc877d5198eab8a3d893c7758c2a8 SHA-256: 8519e7862459f1d536946b8614524362767fd3f1f1dc03da446eb388e41a01e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ClamAV detection as Pdf.Phishing.Trojan-d2528dad23a95d95 suggests a malicious phishing intent. The presence of embedded URLs further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=renewable+energy+boyle+3rd+edition+pdf PDF link annotation
    • https://bavamelamasol.weebly.com/uploads/1/3/4/7/134714994/wasegakegole.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/d8e6614370.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/2046271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5fa19dffc76d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_5fa72c056037f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fb98e4d46191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f9a4d32a7869.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/d8385ccc-a8c7-484c-9d97-b8db24589f1f/maxidoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3faaf61c-7454-42f5-8f29-7e588ddabaf8/64777692895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c270a3-60e8-4a63-98a9-41c99e6bb2b6/5289678994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3706f335-406b-4e02-b940-f4b5d1ec5502/school_excuse_sample_letter_for_disney.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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 5536 bytes
SHA-256: a1ed3ec8b42c00fff492311141121c41f77f2ccc751ce5c617b03a44a7998653
font_01_sfnt_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 10076 bytes
SHA-256: 9118529c1e9d785dc747e3f3faee6f5c2ed0f542e2dd1572b4a5c57a30bf5302

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