Malicious PDF — malware analysis report

Static analysis result for SHA-256 5485aea43383a5bb…

MALICIOUS

PDF

63.5 KB Created: 2020-12-23 10:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 77488d6569229af4b338d756b5555b9f SHA-1: 28d94e3c71d8305dd4ce87ba41c7aa1e8c1ef41b SHA-256: 5485aea43383a5bbdbbc24c9f6da462e79cc6bcdd7330b05db104d0e47510ff0
116 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to 'traffset.ru', a domain often associated with malicious redirects. The heuristic 'SE_QR_LURE' suggests a social engineering tactic, though it's also common in legitimate documents. The document body, though heavily obfuscated, contains text related to 'landscape wallpaper 4k' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/aws?utm_term=landscape+wallpaper+4k PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481282/normal_5faa6020dc566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fb3648beab6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5fba90d04a063.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/694194b3-d58b-4534-bfda-509b729e63e2/10499174744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4748d4ad-53e5-4694-ba88-b5dd47d56e43/tarurir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27d4ebd14ff0dd2a6b98d/t/5fc62af0eaf37e3b646e732f/1606822641914/tusenumafusap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9faf0a190b16b315c206/t/5fdcaad8c32e197a2e09fcaa/1608297177357/sovefegebolilejezugusala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2766dd2f-8d85-4ab1-8458-6e9e32cafda2/sony_sports_walkman_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a79f115-efaf-42e9-8ee2-57f5d482d03d/plymouth_lifetime_class_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4990250-669e-48aa-861f-7c254edd3c19/download_mini_militia_mod_apk_in_pink_colour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a451ef-68c9-458c-9ec6-d59b0f4ce86d/smart_ir_remote_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8554db-4532-42a3-803d-3f0ae6736c97/88523373766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7917c050-44bb-44f2-87da-86860ec222da/lebowobepakozazula.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_off0000bcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 5252 bytes
SHA-256: d8bf2be993908b53ae665fc889c2906fb364a50a0ed6e67cbf602a1876d5d8d5
font_01_sfnt_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 10156 bytes
SHA-256: ac6008cb5984e8ed444a4accffe8d66b8802429fc9c2e1050d0b8e54655a5966

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