Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61dd3d621326cfd…

MALICIOUS

PDF

75.5 KB Created: 2021-04-24 16:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b56ddda583e046afd0f7142e1b8d7714 SHA-1: df2034455613f436b50c4eb66c1474928da096a5 SHA-256: b61dd3d621326cfd96b429ea3f9a334a92640abd13fdd35547ef336154f1039e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' and a query parameter suggesting a lure related to a "sprinkler system won't turn off". The PDF's structure and the presence of many links indicate it functions as a link farm, likely directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://zajinet.ru/strik?utm_term=xcore+sprinkler+system+won%2527t+turn+off PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467043/normal_601a6f7f52d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_6041861c2a23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_601acf1e41d5d.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/carmine_gallo_ted_gibi_konu.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/14226738764.pdfIn PDF document text
    • http://lafarupikawa.22web.org/is_splat_bleach_good.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_602ae35a25a0e.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/baking_soda_health_benefits.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/71796537234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5ff8252475af3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_5fd6e5d0bb950.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/sobitifopoxapupusutafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_605fbfc27610c.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/bivajogukokuvufulekigoxur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_60515f5552250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470380/normal_5fdd9279b3878.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/critical_thinking_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/dipuxidufino.pdfIn PDF document text
    • http://tupesom.atwebpages.com/95808128968.pdfIn PDF document text
    • http://zekafoweratum.epizy.com/wateluvujina.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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 5220 bytes
SHA-256: f509a7048a442b10bd8781fb296d3a3298d7942d329f2f298fbd2c06f06dd6be
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10624 bytes
SHA-256: fac67feb2d109fbb2fa33d5a57cac51d0213ee6834afc9ebd26322654b1a6279

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