Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8ba00b9581e049…

MALICIOUS

PDF

77.8 KB Created: 2021-04-19 22:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5853bfd1020f9e7a96c039d8609d43a0 SHA-1: c4835a1017549eb996618b9d07b08e2b0a386171 SHA-256: ff8ba00b9581e04916680d3f139ffaf7049ac65f6f9b1121a549f3d7ab260ea5
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://kuzutuzo.ru/strik?utm_term=easy+book+by+tammara+webber+read+online PDF link annotation
    • https://lebaburi.weebly.com/uploads/1/3/4/4/134491334/4734226.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/8200497.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/fa03c61f299b.pdfIn PDF document text
    • https://rotaxini.weebly.com/uploads/1/3/4/4/134499982/4653762.pdfIn PDF document text
    • http://plusstore.pro/wajolugivepuvinif23ydl.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/5846434.pdfIn PDF document text
    • http://caterm.ru/pawodl9go9.pdfIn PDF document text
    • https://dogenirifalalu.weebly.com/uploads/1/3/0/7/130775866/8feab63f62.pdfIn PDF document text
    • http://naturmilans.fun/mozibikisisij0784.pdfIn PDF document text
    • https://xulijijexam.weebly.com/uploads/1/3/1/4/131453336/46dd0cc82a8c63.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/47d1f592d.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/6885df893a.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/pebewegamik-jugojitegagi-nelawafit-nowevudajero.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/fexubovikura.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/5830756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_7d77a86bf6ce42c3ab8d9584e5b8a076.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_02555b0f7a3d4d95b78331e81e8e6f52.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_fa58d2bab79a40159733133031118d5e.pdf?index=trueIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_93f3428e3b234ad2a10a164502e03451.pdf?index=trueIn 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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 5328 bytes
SHA-256: 187a82b5de5f4d5db315d2e50c2d02e829355c10854432e0812b082aa7930eaf
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 10840 bytes
SHA-256: e6436064d33e6314a4f24dd1902a840904a27ae792c51d1478f7525c7f95e0d6

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