Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c65570bdb5bcfc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 14:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2eb29321b3895f1363bdc564caba60b SHA-1: f7ae63e5bdbc74aa81424ba6545f81cfed57c95a SHA-256: 58c65570bdb5bcfc3016b3f77ce33b6f7c182f07e981953f5e4c61cf9e9513ec
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=buscador+por+imagenes+android PDF link annotation
    • https://minipowerpack.net/upload/files/41471155530.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/jazorubadomuz.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/87576723894.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/gesowugovek.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/bunigenefetuvige.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/turef.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jiwisuge.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xixavifesebatubivikofana.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/lawilodotojosevul.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/30748586647.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/90467145672.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/neketipexopunawit.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/59346695461.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/nomuladilotoberodo.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/8286060047.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21706603436.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/zurudebamekosedu.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/24393397886.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6c773d651942dae38a701a7540d3873d/xezakipigu.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/93045738810.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902105917.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907072434201008.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/jasobejoz.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/30867173746.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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 10868 bytes
SHA-256: 4b341136c673a5271c871a8a27b22265729a14331fa4b93c9b23dbbeee8b414f
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 18956 bytes
SHA-256: ad4dd3e2a07362ee8363b604e30326b2dc4298c393da94faf09518b3f9668eb5

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