Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8124b9a643f6e9…

MALICIOUS

PDF

87.3 KB Created: 2021-03-27 21:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f90f481be538bfc19d3332a99a073c04 SHA-1: 50cda82a7cc14e97736c90c315be42eca81c3089 SHA-256: 9e8124b9a643f6e9391beb45d547350481c309899205745089c6a150f0f75fc7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://crophysi.ru/strik?utm_term=the+constitution+of+liberty+ebook PDF link annotation
    • http://rawitotizoxuk.scienceontheweb.net/jedugivasepiwotelo.pdfIn PDF document text
    • https://sibibogug.weebly.com/uploads/1/3/5/9/135990875/wupibejijudonuvizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455916/normal_600603091da3e.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/4985433707.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/6318333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_60421fbed808e.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/f0085058cf4867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fd05e1ba8cc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/vapan.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_b1c91a6882154241a6618972cbd3f64a.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_3486cf7870f342fe91f1266f58e63150.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_125c98482bc1438caa43916c9d276dd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/what_is_time_dilation_in_special_relativity.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_a4134209176345f08ec28383f2361769.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_5bc359a4bdd644b69a77bb79d65499f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/bloodline_series_1_episode_guide.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6ad55dd94d504c67bf28bb704dbee7a7.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 5012 bytes
SHA-256: 2fc588d8b72ca6cf4c4adac33ba4a1bbbe597a2e9378800582d0dffe6fd393e9
font_01_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 12580 bytes
SHA-256: 1de0f773c215f364eead825fc73bd4175e95aa3ad225913fb71ec02d831b3029

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