Malicious PDF — malware analysis report

Static analysis result for SHA-256 8896334cc55ecb42…

MALICIOUS

PDF

80.3 KB Created: 2021-04-19 07:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c283a9c9f98dffff2ad88475b0d0afcc SHA-1: 2163a0611d44564147c179d77eb4a35495becefc SHA-256: 8896334cc55ecb42ef9d9b78d8684a71e180dac7587067b846501035be6dcb42
126 Risk Score

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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a larger network of malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=librecad+commands+pdf PDF link annotation
    • http://dokakepitizix.medianewsonline.com/carbon_nanotubes.pdfIn PDF document text
    • http://xenakasewexibal.sportsontheweb.net/augusto_cury_libros.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/gitebeno.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/duvozurawimo.pdfIn PDF document text
    • http://return-0.com/lifuserudabetivarizi3gqw7.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/1134734.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/the_freud_reader_online.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/jamofunifexo.pdfIn PDF document text
    • http://prizinsta24.site/796976735720je5b.pdfIn PDF document text
    • http://sedouche.xyz/96314232588y51q.pdfIn PDF document text
    • https://vokafevevuw.weebly.com/uploads/1/3/4/3/134320681/597f3baa7.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/wazulusuwibifemoje.pdfIn PDF document text
    • http://indital.fun/swann_dvr8-4575_firmware_updateue4c9.pdfIn PDF document text
    • http://copyrightproblem.com/heil_central_air_conditioning_unitsuf2p1.pdfIn PDF document text
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/3223775.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/dc4bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/firefox_67._0_3.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/mixuzojupapisogarisela.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/libro_bartleby_el_escribiente.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/games_like_civilization_revolution_for_android.pdfIn PDF document text
    • http://lexamokoxerum.atwebpages.com/six_sigma_black_belt_project_examples.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/lizosujidadetumexumi.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/eia_crude_oil_report_investing.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_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 5348 bytes
SHA-256: b16222e2c8911a11426db8991331af1f4e1348dda8347f9f49ced517eca5d76a
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 11056 bytes
SHA-256: 646603edea881723e84e784df9d402bdf45942a85a6ce22f0760cbbc4570de21

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