Malicious PDF — malware analysis report

Static analysis result for SHA-256 934f53ff8c6162d5…

MALICIOUS

PDF

105.3 KB Created: 2021-03-24 10:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4bc36e9e803cea93f88b98f0c66221fe SHA-1: 1068c16ee63fd4441854ec6484d5b02a89223280 SHA-256: 934f53ff8c6162d52c2f5b750eab7b2e984589c0cbc709554c4ce7e7bd1351f0
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://maypoin.ru/wix?keyword=one+crazy+summer+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475985/normal_600b1956054db.pdfIn PDF document text
    • https://jezonekapinojel.weebly.com/uploads/1/3/4/6/134619201/marusisez.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/bipulekaniz.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/sevojupep.pdfIn PDF document text
    • http://topcreditreport.info/dovasozusetomixa1g2el.pdfIn PDF document text
    • http://legendbilisim.com/verowapovopog6vri6.pdfIn PDF document text
    • https://legaxebojidonet.weebly.com/uploads/1/3/0/7/130775342/fidug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5ff10da01b6c3.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/ab39456a4f275f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_60261c1c42f3b.pdfIn PDF document text
    • http://wowit.pro/354230706371j0vg.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/mubefula/chennai_gana_whatsapp_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c250c18-19af-4053-b7d3-62935033375d/programming_foundations_with_javascript_html_and_css_coursera_answers_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7aff13-6739-4a5c-a483-e79bdfda26f1/41022638621.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/86814337810.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/rojimazugexenukitunexuvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16f983e-eda8-408b-adef-93344747e12d/western_digital_my_passport_ultra_4tb_external_hard_drive_price.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_off00015edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDB 5404 bytes
SHA-256: 2f190787e832ed8c6ff20e80c872d78e67075faaa888769d4edcde8b469f52ac
font_01_sfnt_off00017132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17132 11404 bytes
SHA-256: 581fd1f89b9c75af833eee46ae6b7e6faffac5424f18b19840f84c9139c9dbf5

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