Malicious PDF — malware analysis report

Static analysis result for SHA-256 013c1bdd788dc863…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 22:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c93ed132002f1ee920eca024b397852 SHA-1: aa3d298ff7c8d3fd6ceb437a8db94f9f64fa05d1 SHA-256: 013c1bdd788dc8638d8da0a2d3087d6f255b4a30180f57b7a9f8cbd2efba2781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=fallout+shelter+editor+android PDF link annotation
    • http://grgct.com/ckfinder/userfiles/files/bekixebozezu.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/xuwitirufozobofoguranol.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/fukabebebejunekomikom.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/jagejopadadepum.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/guranififixujigorixe.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/xosenawijakamasekugagemes.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sufevubodebege.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/mixoperagebagolem.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/16655948760.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/noduteladivixug.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/70027404609.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/34201382120.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1c84e209---63326055856.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/17843086226.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/15679773465.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/21315358184.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/18633223878.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4ad77b5f0e1433f304bb17321e576f4/munoja.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/73367201497.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/gibegitokopeg.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210906143331505694jp5d4.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zavugozotemelu.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xanerunepobilozuz.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/fakegubafe.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/dilomupu.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/19544827495.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/4725030037.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/jonebubogefozalevaxob.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 19084 bytes
SHA-256: 4fe428e5cd2e80a468d39e4bdffa4f4a32bd6f24e463ce0c228f1ee0eff946c9
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 10420 bytes
SHA-256: d4276c63e5e9a034ecbc64dc5b00db85cce3f435af80d809916e2e04fc00ab09