Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ce597b7ce223b9…

MALICIOUS

PDF

73.6 KB Created: 2020-12-20 09:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 92f70890835b8f137ba19cb0c0ef2ac2 SHA-1: 2c794306e34e36bb1ab9e32a5860b5832e840564 SHA-256: 71ce597b7ce223b9747b7ea26524e973335dc7fe310bd7e256c66a824503b271
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 detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafftec.ru', which is likely used to host a phishing page or download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is a strong indicator of malicious activity.

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://trafftec.ru/123?utm_term=5+non+living+things PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f8d7291900a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5fa217da854d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/ios_app_store_icon_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd55bb6394b41d64250a19/t/5fdde3a0f11f517dbbb6789c/1608377249305/b._ed_online_application_form_ignou.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a1f76e-a4b2-433e-8e92-d752ae7d2b26/83340963044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d232f020-1f9d-4f03-936b-5191e794d0f4/supodimamedalir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc114788ef7301f8b11b9bb/t/5fc490e6f3de5e49b5f6b5d7/1606717670291/44872905392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66edbf0-54ef-412f-8457-08d43bef4015/shade_of_vampires_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eca2be9b6939510ae43f/t/5fcd41522fa8bc6bcdf6785e/1607287122570/titabovijewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13fa500-6c9b-4ca5-9222-1289b4f1219e/novos_hinos_ccb_hinario_5_2328.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11a296b97992eb55d442c/t/5fc77bb81d106d256bc47afa/1606908857972/homeschool_freebies_by_mail_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190f554a-a2c8-4c65-af3c-9276a86c6392/3516348559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f45afd5-c7b7-45dc-80e8-f1d9a1dd25d7/90101618678.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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 4728 bytes
SHA-256: aac1095bab30ef85eb205eab9937e9cbdd2fe5abe8ea36c2f3beb0494b141c9a
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10040 bytes
SHA-256: 01232ffa7d8c9d211056edd28dd7e1ef60b84b7871ec78dacf5a905890cf1d89

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