Malicious PDF — malware analysis report

Static analysis result for SHA-256 b161e12a473e0329…

MALICIOUS

PDF

78.1 KB Created: 2021-03-26 10:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 06638b84cf59bd59b5209a7ff4b8bda7 SHA-1: eb8857e4d5de9a5fb162c2bb21e8fbf2f94df619 SHA-256: b161e12a473e03299bf6569c5fec44d21f8ddb7ca02d2b5db19960b7accad536
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-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://vilenefex.ru/123?utm_term=yuntum+hd+video+songs PDF link annotation
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/sotigimezubi_zuxax_gogaj.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/gekal-nimunok-lofewaselasenug-vuwulozoke.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/Qo1jarA/kuzebifijakuvegu.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/ninez-fafifotam.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/nghhdhP/35490131206.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/3540626.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/hbKKaji/vivavideo_video_editor_maker_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/jgeNhb4/48287211619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_5fe8ed8b6fdf4.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/jiGfjah/xemaduduwos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd8d626f3f4f.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/7636555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5ff8542857afd.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/papubol.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/juwibupegapumofesuj.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/fuferuzes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_b7b222fcb3204b70b726d5270ace7b19.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_5b0ff2bedc434155b3792cc74edbcff8.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_9511c66104f1415ebe9aa7b63af12246.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_af51cd6a0ab04c53b29cbc1594b70aed.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_48cdc82d681e4dfe9a5548bd48613ff0.pdf?index=trueIn 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_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 4924 bytes
SHA-256: 5efb94991c5f7959a853816ce35c8b876c5f10f82f2563d09086f954ffea9f36
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10696 bytes
SHA-256: 32bbb4cfb7a943903656dde88317b0214a091ee12f91052c182737d7a10b0d30

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