Malicious PDF — malware analysis report

Static analysis result for SHA-256 958fdd27bf536f9e…

MALICIOUS

PDF

96.7 KB Created: 2020-11-14 00:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2f7c6872f26ab57eafa35fe0a7676de2 SHA-1: 2e5d7fc09039300d8456922f28b8501eb26c25f7 SHA-256: 958fdd27bf536f9e4aabe22a26cd5259d18a15712f295866dd8878982d773672
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on domains associated with link farms or SEO spam, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Dark souls 2 graphics mod', aiming to trick users into visiting malicious URLs.

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://traffine.ru/strik?utm_term=dark+souls+2+graphics+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f870e95db664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f884a687391a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f8d65b9cde7c.pdfIn PDF document text
    • https://zemodeviwiteg.weebly.com/uploads/1/3/4/3/134351550/mujinatas_kizovupewuduxob_xupad_gibitera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5fa7b1b339e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f9a6f3d663b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f90d4ada4c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5f913bbdc459b.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/bf0d1281-0d06-4c15-aa3a-4cdbe0a6ccb7/lejivupaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f6a071-a4eb-4dc5-9665-0421520ccffe/xobibakoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9329dd15-a2b7-45c0-b49a-5a17f426c4a6/are_elementals_negative_energy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c75f1c-d13e-4cf1-8d03-cc18dea5a100/64928002423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e847bf73-b5ee-4ca7-91fd-d9e45b185687/69265165522.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_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 5684 bytes
SHA-256: 35412a50b174634c080772614ed40f9904824b58bdadb00c197c028f3d42d734
font_01_sfnt_off00014449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14449 15864 bytes
SHA-256: 9800204977b386eb08e438a25dbe7888a64c09cf75b1b0e005123ba36e31e2f4

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