Malicious PDF — malware analysis report

Static analysis result for SHA-256 e689854d1f55eed4…

MALICIOUS

PDF

67.5 KB Created: 2020-12-18 23:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 91e4933acaf2e2252a0edd52fbf6766b SHA-1: e830da5d67b8e999e3ce62257c2ff62a8200f234 SHA-256: e689854d1f55eed4b68cebef403ef8a567b7aa34f9d260e5289b14afcc78234e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. An external URI pointing to 'trafficel.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Barnstable high school calendar' and 'wkhtmltopdf', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=barnstable+high+school+calendar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fc7508fa4088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fad5a5136ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470405/normal_5fc979f3199ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_5fceaf28a05f4.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/81a5831b-3491-4f0f-a469-bff87d41959f/89847676674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0cce99-dc84-406a-b274-bdc4a7c0192d/car_tft_lcd_monitor_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a89988c99b6d37b8817f/t/5fce8c4b954712059b825aa8/1607371851886/famode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ec5b13-19c8-4665-8241-f87d185e0a54/47625971533.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6496268612547ed82b646/t/5fc85e54d17d55300fac19ec/1606966869837/business_games_pc_online_mmorpg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1630612facd59ceb05ffc/t/5fcd0099f94b6402b21d3668/1607270554056/jisutidugupunorijitalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebb211f-5963-4a36-a7ee-0be0533544fe/92002263293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef27d9f3-5463-41e7-adb3-35e186f2fe70/wubolinawumizi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51c0a8787e879898714dd/t/5fcdda660ab5d62feb14bbcb/1607326311895/chinese_fishing_fleet_peru.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514f09698b02c7f3b9635/t/5fcae5987ab0f364aba14d74/1607132569577/51063455544.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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 5388 bytes
SHA-256: a6794e366f00a1e65b875b7b94ea1953cca2d121cab930492ad8a8b271da4705
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 9872 bytes
SHA-256: e1258dcaa0481a525d48443381c66fc45cff56f1cc58c93ccb8b95d3dac79dc2

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