Malicious PDF — malware analysis report

Static analysis result for SHA-256 339135a2171a5487…

MALICIOUS

PDF

60.1 KB Created: 2020-11-13 07:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d15bcc2229fa03bd2fae26554fd8f301 SHA-1: b89b921d1dc3949033e1f0de7fe45a6902d551b2 SHA-256: 339135a2171a54875f9d3ecd00f84a0e527706d77e2c7d7ac7cb9ea6814c3725
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://trafftec.ru/123?utm_term=uno+unblocked+games+techgrapple PDF link annotation
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/lanaxutodi.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/1734890.pdfIn PDF document text
    • https://wepubimixojipo.weebly.com/uploads/1/3/4/5/134584552/126344.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/da4292937454ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8c46ee19c3b.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/9690403.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/71cda4164198.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/5532878.pdfIn PDF document text
    • https://nafizanoride.weebly.com/uploads/1/3/4/5/134596231/guzutipurujarex-gojifuwa-balolowelakosuv-nuzaduwanikima.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/f83eb284-a8e2-4759-ad08-a90eb6992d91/wadoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ac26d9-a507-46ab-ba5e-cff8126843cd/43802943518.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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 5684 bytes
SHA-256: 700c1fb37d05703f75807a122a225bc13aa2203a1a3eaa3b9663630e34e5f48c
font_01_sfnt_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 9904 bytes
SHA-256: 01025d28899481609ed1f518e015d9c6356618d6410f1fdc20c48958264441ae