Malicious PDF — malware analysis report

Static analysis result for SHA-256 4549074b6529a13c…

MALICIOUS

PDF

74.5 KB Created: 2020-12-31 21:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 153b619c2e33c60e79b5e14436a9c4b4 SHA-1: 71be3146d01603623eceffa251f6fec790c37f2a SHA-256: 4549074b6529a13c9c9a2466657e75d6ec4da2a73e64ac767735399ed1f80912
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

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
  • 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://trafffe.ru/123?utm_term=5+elements+of+expository+writing PDF link annotation
    • https://cdn.sqhk.co/nupegefozub/hbidIhd/24728391156.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2527632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f8bdd4d47322.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/hehhESr/ear_infection_symptoms_babies.pdfIn PDF document text
    • https://juzumefewuw.weebly.com/uploads/1/3/4/7/134766708/vetugagog-petoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5fb50dac965e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5fcd354ca60d6.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/xalasawu/88485309601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa47c22-dc10-493e-aa7c-2c2f2e515968/ganodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4280c13-cb7d-409e-bec0-25c626a438b9/mexufikusolufarisumuvad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c185e45-12e6-4bd8-a4fb-11e80c017c3b/75680504659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1916ecd9-809c-4b9a-a8e2-e54687291e43/83648793070.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/63761856237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa408a5-5c61-480b-88f0-b810b97405b3/jonafevizejujazotad.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 5304 bytes
SHA-256: 2869d0b6eb593403fe6c738bc79e1fa3d7ab34e7dbb88771dcd4b0531027e171
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10224 bytes
SHA-256: 3bebae6de0968cafcd6df5a7c416f6b3fb0aa458d2ca4c5cf25894f24b489cb1

Open this report in the interactive analyzer, or submit your own file for analysis.