Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e1e75018cb5c95…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 18:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 066a225ee70fa66937f4ca3f1a2e4e17 SHA-1: 27f09e41f62d759d0e58ed789f69a4a5a60afb52 SHA-256: e1e1e75018cb5c95a684752bb3710edf948243a31d848a1af56f2c907afe6cca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, identified as a 'PDF link farm', with the primary suspicious URL being https://kuzutuzo.ru/123. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://kuzutuzo.ru/123?utm_term=metastatic+prostate+cancer+guidelines PDF link annotation
    • http://lazujifoxupa.getenjoyment.net/coleman_spa_parts_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_60240de835181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fce5dbc88dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_604cbc0aef728.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/47883124303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_5fe8f95f872eb.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/pdf_to_word_online_free_ocr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_5fc88d0308992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_86142384e4e3424c8f6c296f19947910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/nigab.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/rijuvakok.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/gta_5_wasted_sound_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/sazekagupuliva.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/53921795280.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_cbd34bbe48a94faeab1846a2c72b9cd8.pdf?index=trueIn PDF document text
    • http://birukuf.onlinewebshop.net/brihaspativar_vrat_katha_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/tazetaw.pdfIn PDF document text
    • http://vunonam.atwebpages.com/9722938984.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/18138025798.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/rockwood_570_dust_proof_strike_template.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/james_patterson_alex_cross_film.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_a0ece3170b394a3db8e035d765cb00f1.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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 5248 bytes
SHA-256: 3e31ad133e0ea018940762e904188c8854e32f8f19cc1008867cff90aadcbb4f
font_01_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 10232 bytes
SHA-256: 76943636f1adc1066b6065669335aebce976e14c821d2c53eeb890946753bed8

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