Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c75d318d46acb91…

MALICIOUS

PDF

75.9 KB Created: 2020-12-04 15:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9fb9a833498996c9e392faac076c7b0d SHA-1: e9a2a3cbc9919682a61df371016e3e07718ee143 SHA-256: 4c75d318d46acb91a690db564b7f24581abd310afe99c024e8a83082e8c53955
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ggtraff.ru/123?utm_term=fire+ants+in+new+mexico as malicious. The presence of a link farm and a malicious redirector suggests an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=fire+ants+in+new+mexico In PDF document text
    • https://wilosobofixi.weebly.com/uploads/1/3/4/8/134858013/c8fb5.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/230abc97-ca11-40c2-929d-01bba6bd664c/lamavofofaz.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/motor_vehicle_dealer_manual_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/chemical_equation_for_formation_of_carbon_monoxide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18bb28f-6df0-475d-a7c0-1b7e362aac36/24032751593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e948fd0c-48c9-41ef-a249-0559ca749cd1/19591587460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40e8d81-4954-4896-8163-2d35a4ff7738/17764723906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0290c63e-d87c-4117-9146-15541a2b140d/18122614403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab70de8-2930-4a15-8a9c-fdc9daf738d8/free_coin_master_spin_hunters_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/nurofuvawimanupopunazat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afabd286-59f8-4830-abc5-a63b6549755d/82411378358.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/learning_pyspark.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/11687054392.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/employee_of_the_month_nomination_sample_memo.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/minecraft_1.5.2_download_apk.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_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 5028 bytes
SHA-256: b281ed5a560e4ecb974f0e4e52e4cb2a86fb08de115c64c742fff2207da062d7
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 11560 bytes
SHA-256: b3d684e8a5de8f0b8322b88a08bd49d69236140cc3bd164e955dc2391e7eb8ad

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