Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac4f790af8ae9a0…

MALICIOUS

PDF

68.4 KB Created: 2020-11-27 00:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c87175dc7e301b617bf0efdb09148ff1 SHA-1: f67c0a5f4ca6295e8ecc2d50127e31df6ba4c82b SHA-256: bac4f790af8ae9a0f9fea9f54bde0d1c721fec6db457fb643eef76fedb643837
156 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 5

  • 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.
  • 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://traffking.ru/strik?utm_term=tamilo+com+tv+serial+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f9c3535db705.pdfIn PDF document text
    • https://mematuseb.weebly.com/uploads/1/3/4/5/134516495/9729159.pdfIn PDF document text
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/vujakinifomuwag_rumaxuwupenebag.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/9ea622648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5fbe68796cc9e.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/2aa778649b8.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/3204337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/zozabedusomasifotozipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da923876-658c-476a-ac72-f0944b054aa9/affiche_contre_le_racisme.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/law_and_order_svu_opening_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/19997168529.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/nisus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d99aed-9660-44b8-ad36-ba0405ede1ee/folutedalisebamafidojus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 4636 bytes
SHA-256: ca690df09a61e6682549a55776460c6492528c650f34c0b21d546adfbb5d888f
font_01_sfnt_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 10328 bytes
SHA-256: 2a6211ee79284a95497532e990baae19d1f38b484632f392f46fe6f1fb4aa520
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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