Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef666b4e31a52d0a…

MALICIOUS

PDF

70.4 KB Created: 2020-11-28 10:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 65c4d7ad6e3b60396f4454ac91fcc5de SHA-1: 734d381f13666751d1f172b5a39c17de6877b4e5 SHA-256: ef666b4e31a52d0a930ce6508f78702ed754e20a5cf77afbec8f4a4a8ae33741
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in phishing or SEO spam campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=balgeet+marathi+video+free++hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fa54102765f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fa91781146a4.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/8554501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_5fbc5c131b926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5f8d89f7bc8f8.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/1de436d8-b097-46b0-9e78-16732e1a93b5/lego_batman_flight_of_the_bat_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80ad7b2-8a44-40c7-97c7-4ee428ab52d1/vukapegebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b683e73d-fdf1-499c-84eb-880e11f98a91/slow_filling_toilet_cistern_push_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753d4498-3cd7-4892-b845-d9eabf6ca838/beboncool_android_bluetooth_game_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cfb131-2284-4339-893d-2121d181231d/17767488830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0924130b-cd4c-41e1-b0a7-108632e2f1eb/fefepenezi.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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 5252 bytes
SHA-256: 78464d7124dbc0a12565abe9fe406111519b62d0059cb2924cf8a850a6bf226a
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 10572 bytes
SHA-256: 1c31ddc177b4ec3905f0e101b062b1f2f48894f4314cbac3576679ebc6de22e3

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