Malicious PDF — malware analysis report

Static analysis result for SHA-256 896bbb6d5a096fdd…

MALICIOUS

PDF

67.2 KB Created: 2020-11-24 00:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e874e08445720be9919477f75c6c1aa SHA-1: 0cf3b9af1a0996159edb34ea6366f6c2b589992b SHA-256: 896bbb6d5a096fdd5755bf7c6e2724cb64a48c3d79c743aea45b84c13cc44024
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 0.9998

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://trafftec.ru/strik?utm_term=richard+williams+the+animator%2527s+survival+kit+dvd PDF link annotation
    • https://zujususo.weebly.com/uploads/1/3/4/6/134615591/6367892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f96619873df4.pdfIn PDF document text
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/dcaa0e1a706f48.pdfIn PDF document text
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/xidode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5f9ea95461b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5fb81e60ad21b.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/3757a8ce6b3c95.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/rodurojarekadizizida.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/55668576-6ca7-44a8-a405-491555b41c43/85572376311.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/nikotofutetarexe.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/dawejelozixupubamunaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fcde0c-9041-4ac8-b416-66bd44a57ef0/80229106580.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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 5436 bytes
SHA-256: 1f58cd4ca0f5142d4aa4931e27a012114dae3c7aa4e7537df2f567ccb4f9d958
font_01_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 11000 bytes
SHA-256: d2b13670d19ccf451b036821431b4a6100d84014026f6aca838966a9c77e958a