Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54c930a9cc5c337…

MALICIOUS

PDF

65.1 KB Created: 2020-12-02 07:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 258967f0a8d6be0dff3e0d5b8576541a SHA-1: 362b5f18b13defc0f21237d2105d9e7a8aa15ac3 SHA-256: a54c930a9cc5c337359c257a029bd55e3b749c1cd6200e48333fa08fdb55fb3c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' firings, strongly suggest malicious intent. The embedded content, though heavily obfuscated, appears to be a lure related to a 'Gw2 cooking guide', likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=gw2+cooking+guide+400-500 PDF link annotation
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/3917a5.pdfIn PDF document text
    • https://fubaxegadajud.weebly.com/uploads/1/3/4/4/134454669/191a5.pdfIn PDF document text
    • https://voligamaxe.weebly.com/uploads/1/3/4/5/134512074/6097909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f9e909a5f32e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fa8062d4067b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f873dbca9904.pdfIn PDF document text
    • https://pumoguviponurin.weebly.com/uploads/1/3/4/7/134773216/lusito.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/5399820.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/mixegupemux.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/4ae9dc3f-4f50-4aca-be98-a7949d65a676/megesigimudexusufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74867549-986b-4bbe-8672-67bcb6b07f69/cprp_exam_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd96adb6-84d7-414a-b17e-17b1e6a62c3e/4790834590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93805b8e-cd7e-491c-913c-234436803ea8/jemaxepif.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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 5296 bytes
SHA-256: a566595773483b1998e2074584cac277a512e34d19dcab2273d3fcd5a2f9f241
font_01_sfnt_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 11296 bytes
SHA-256: 036f4ea4d60e8b94f25c26e609675a46e20d5b0e3b033583cdbe5b6241684337

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