Malicious PDF — malware analysis report

Static analysis result for SHA-256 921cd5f61b08ba1c…

MALICIOUS

PDF

73.4 KB Created: 2020-12-04 08:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 13bf135594e65998cc3a3aaaaa979a2d SHA-1: 9b479d5f4d5c3875ab56cd27f7a44ecd08744880 SHA-256: 921cd5f61b08ba1c51a28af37c53dcbeb66548c74720e9332cef1ae6ee7782b3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/123?utm_term=surgery+pocket+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464052/normal_5fa5f1456d22f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476782/normal_5fc75690deb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5f9caea987e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_5fa69288953f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f88f1b9b81f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fc0ce4c7531b.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/54f2d982-a8b6-4afa-a34d-494d9c72cea5/muziwejaxiwogogow.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/guvinofaratataf.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/formation_agent_d_escale_commercial_gratuite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70959ab0-c9b7-4a88-b7ad-a9551fd9d0b2/91120433482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585d110f-5638-44cf-8ebf-a8d6c525abf8/xoruwexazebara.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/84179632600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c7e88a-b710-45d3-a347-7d3868e2e3ca/vesuripibujipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fabec4-d9b9-4635-9e8a-35e251faafad/toccata_and_fugue_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/android_storage_emulated_sd_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2869cf-835d-4055-a87b-bae03c55cdc4/54921432855.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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 5172 bytes
SHA-256: c25d805307f4e85fffa39646302fecc16201e4a30f1e5e8077e7000ac8dcbc74
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10524 bytes
SHA-256: aca3bdbada4c355e492d2c0eb0ac63a6bd79ba758d5675e8292bf8be3af8b894

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