Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ff720c7ac03622…

MALICIOUS

PDF

76.8 KB Created: 2020-12-10 05:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 884d986782625e55af1270a507f6c8cb SHA-1: 43129251da93a5144c74807ddb296eed0b5cd88d SHA-256: 81ff720c7ac036223715211b3f1d493c2ef9784fd3468f7791f3564f04fe1095
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://trafffe.ru/aws?utm_term=new+cartoons+movies+free PDF link annotation
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/5f9297.pdfIn PDF document text
    • https://sewobefavewekog.weebly.com/uploads/1/3/4/3/134367647/29f1a1ea09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5f9f349ee3c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5fa0cb90008ee.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/jofefedakom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f8bacd78f00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5fa9aa9e6528b.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/lafotowudepir_zaxareda_ridupa_gebumow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5f983bba6e512.pdfIn PDF document text
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/dc0bc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/dowurateruzolunoz.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/tom_and_jerry_cartoon_hd_images.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe47a8fa04221c71ed8ab1/1606305705020/vpn_apk_pro_rexdl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d84b5f0d731e16a86864/t/5fc84337f97c193540e981ef/1606959928086/fovobipudamimigesositis.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/7360474127.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_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 5116 bytes
SHA-256: 81c88ba0f66c94e64905e0dd950fd3226a08a7a4424b52c1e2a9ca26e17d1855
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10644 bytes
SHA-256: 5a9222acb3cd1744e1d5dd0d1ede177a19f49313fea7d572f8ce72544a068ae3

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