Malicious PDF — malware analysis report

Static analysis result for SHA-256 c743cb5d09388c20…

MALICIOUS

PDF

78.0 KB Created: 2021-05-22 13:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6a7afa6da900ab74c327ecd245e093a8 SHA-1: cee7156a512ac3978b7b7fd7a4d56c1aab52d105 SHA-256: c743cb5d09388c208d88510dd5a82aba45d62bdbe34e03f309bde2404b80a4e4
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://lozipotod.ru/strik?utm_term=best+ds+emulator+for+ios+14 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410000/normal_6059786603997.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/pasun.pdfIn PDF document text
    • https://vonasadan.weebly.com/uploads/1/3/3/9/133986887/wolerusito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414360/normal_600935e9818db.pdfIn PDF document text
    • https://muboxofibadufus.weebly.com/uploads/1/3/4/3/134310828/bezarujivuwiju.pdfIn PDF document text
    • https://zevupizufaf.weebly.com/uploads/1/3/4/3/134315684/kagagitafanuzamume.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/a1c40c.pdfIn PDF document text
    • https://badukixekuxa.weebly.com/uploads/1/3/5/3/135388400/365933.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/zepofu-bojonu.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/4625715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fd8df90a69a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6055cd3c168a3.pdfIn PDF document text
    • https://tozuxixawijere.weebly.com/uploads/1/3/4/5/134523333/wawojulot_feluzivazob.pdfIn PDF document text
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/2951994.pdfIn PDF document text
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/mexoruwus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_602678bc0cca2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366033/normal_5fee533d35c4f.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/7356645.pdfIn PDF document text
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/2807046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 5240 bytes
SHA-256: 4c03bab57fd47ce4a1f982862da9e74459d30c6a8c5c13fc0104a494f9597486
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 11004 bytes
SHA-256: de723ae797c993a6adaee142cc23628560d9a014cc21da57f1e61ee19caaec03

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