Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ae7c4298ef145a…

MALICIOUS

PDF

75.3 KB Created: 2021-06-02 02:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e3117add0c59994e818ca92444930ad5 SHA-1: e65602c9ae7b9d75a4fe34250cbf64714cbaa307 SHA-256: e4ae7c4298ef145ab76d664bf4cac44d999186e0319b5f265c5419b565de9cc5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The document body, though partially corrupted, contains text related to book recommendations, which is likely a lure to disguise the malicious nature of the links.

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://irlanc.ru/pbw?utm_term=what+books+should+i+read+to+my+baby PDF link annotation
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/doxek-zugirofedi-jupew-kitojilulekok.pdfIn PDF document text
    • https://linizudozurori.weebly.com/uploads/1/3/4/6/134640128/sapixuzored.pdfIn PDF document text
    • https://pomaripo.weebly.com/uploads/1/3/0/9/130969966/259562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_601f304eec0f8.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/7492001.pdfIn PDF document text
    • https://wulidinuwiniz.weebly.com/uploads/1/3/5/3/135326152/dolake-dadan.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/gewinivixa.pdfIn PDF document text
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/bd94e741c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_601ad3827bdaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_605d72703f205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_602e02adad084.pdfIn PDF document text
    • https://tonapakosu.weebly.com/uploads/1/3/7/5/137511677/tabojura.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/355dd6cc3e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://togiwuvoze.pbworks.com/f/elvis_wedding_chapel_las_vegas_renew_vows.pdfIn PDF document text
    • http://zudilazo.pbworks.com/f/31100309654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebe1aca-c52e-41c7-853f-07716610ff6b/58594738484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03df2158-9ace-4295-81db-61732dc6184d/tagebowuf.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144482835/kanov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd22c2c7-1e48-4d95-a17c-0ad6d1ad78a3/80979614928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615da4df-9b32-472d-a11a-caa8bfba7063/troy_bilt_horse_tiller_transmission_repair.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5384 bytes
SHA-256: bd737d950bf05594366dfb1a0418de27ac0ab0937c7d3039243cf3a205e1262e
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 9944 bytes
SHA-256: 692b36519995269616d32dcf4e62c9773d76c0563f402774a74571f54169af57

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