Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dc9b6c56bf1ba6…

MALICIOUS

PDF

70.5 KB Created: 2020-11-09 20:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ea41d337d0c88b75c8b399ced6de217e SHA-1: d1b3cbaa5ad6db6a35036b2b51a9c3b2839dd2a4 SHA-256: 41dc9b6c56bf1ba62f0ac2612ba64c047e57f6e8c8141ee52558d91bbdb1be67
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?keyword=fm+7-22+study+guide+questions PDF link annotation
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/7a2c5a1.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/gubizuzavaxopi.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/jolino_fujiba_lokowupijava_vebime.pdfIn PDF document text
    • https://kolapudavuvoxe.weebly.com/uploads/1/3/4/3/134315715/9150110.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/lavuru.pdfIn PDF document text
    • https://midomiwu.weebly.com/uploads/1/3/4/5/134592630/buvisavexeguketikuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735bd69-6b4e-43db-81a1-e3e313cd7591/hermann_hesse_narcissus_and_goldmund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cbf7e1-d423-4112-837f-594a800010e3/jumitotiselevalekeve.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/tikowixipowuv.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/57300071130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0974c78e-5910-4c36-87f7-b8b47d776f19/misigewasapabavive.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/66270824065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bc1e62-ec24-48b9-ab22-85c511a65257/966200821.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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 5232 bytes
SHA-256: 179c826166acb9598967fbaf22dc82a5bc9fb76d8ab41f7463ce626d9e1bf290
font_01_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 12120 bytes
SHA-256: b14295f2a80b20421423feb836308fb23251dcdfe2843d2316cb3324efb864b7

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