Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23896e5f8f655c9…

MALICIOUS

PDF

72.0 KB Created: 2020-11-18 09:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 205d1b7c4b08a7e52ce77d476a3826c7 SHA-1: ece77e5faf03b92ab0a7fe82ea5812a0a7045e12 SHA-256: b23896e5f8f655c9d425055739967d18589bf933f330e7740f1ef25becd5769f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('trafffe.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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://trafffe.ru/123?utm_term=the+crucible+act+3+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f8bdec4d1ea2.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/vuwozuniv-manijumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84d7cca3-f32b-4e19-b58c-72bb914a8fb2/kinivo_btc450_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caef2882-7b95-455f-80ad-0df03e25ddbf/alex_ferguson_my_autobiography_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda4e3b5-5477-43b2-82bd-6dd7ce5153c6/new_york_m4m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f9c458-4e13-497c-83f9-b15a71095c8c/lufisibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04cc51e-f5bf-4a2d-b58a-872d3b1ee2a7/doom_flash_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c328ab-96be-4fe4-8251-dd2cf302f09d/44832702055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd15bf2-3395-41c8-a53f-4a931ceb53fc/88145214645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afad0e32-4f25-475e-a051-d48dcec3c886/tewikodakikowokitupapap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665978ec-b88b-4ff6-83af-069de9dfbd96/50993690482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cef237-2d86-41c2-9b33-c815f0ef374e/gamulatirekorefisekado.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 5072 bytes
SHA-256: 6d2e89b493049d616caabbe93389cd34dfc5885c5ec8095b7c58e756f8d294ac
font_01_sfnt_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 10568 bytes
SHA-256: 74dd0901543cc2fa39ef94727fa0439074545e5c3a4e5e4469cdfb9ecf1ab244
font_03_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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