Malicious PDF — malware analysis report

Static analysis result for SHA-256 981c52dff5f56774…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 08:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4efd9cf716f6be2d94130c9ec130a30 SHA-1: 202f7798f21458f2f7de60650378ed9b61d6e522 SHA-256: 981c52dff5f56774d5b079acb9c995344dc847946adff40c0565a8db31559bcb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and using UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=logitech+m325+review PDF link annotation
    • http://pewujok.mypressonline.com/20067623609.pdfIn PDF document text
    • http://pefumaviba.22web.org/misarurujega.pdfIn PDF document text
    • http://famafivas.iblogger.org/buwomazifufukaxuzu.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/97894242484.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/queen_piano_sheet_music_easy.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/how_to_work_at_disney_store_shipping.pdfIn PDF document text
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/613d33.pdfIn PDF document text
    • http://setofexperience.site/yamaha_rx-a720_pricewldgx.pdfIn PDF document text
    • http://djami.ru/xilisoft_video_converter_full_version_free_downloadz1z0z.pdfIn PDF document text
    • https://tolojosokuriw.weebly.com/uploads/1/3/5/3/135326177/tuzinajew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fdfcb76604f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5ff9625b502ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosawivigibi.rf.gd/43952628974.pdfIn PDF document text
    • http://posikin.myartsonline.com/45190218810.pdfIn PDF document text
    • http://ditelaxi.rf.gd/tumokozifukokevosolebosup.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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 5308 bytes
SHA-256: dd4ec601498cb6afaf4387b38cbdffe7d0607770dad8f6eed49e3ec3a408d3b6
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 22792 bytes
SHA-256: aa3f0516233552c8402ddc90d968c93ec5d97b9e3d072f19696dfc5fb034b79e

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