Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad7dc43f1d12cf0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 18:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82f4b4ebbe564c338e541cbfb555af9a SHA-1: 1952038e33f19fd8725c8c786e7206c42b16349c SHA-256: 0ad7dc43f1d12cf06ed6e0631b66a7ee72597852814c0c203f01911b5ef2dc0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and ML classifiers as malicious. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting malicious intent. No scripts were extracted, but the presence of external links is sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.valathors.com/ckfinder/userfiles/files/mefurejimamanozukefuzizo.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0b598c45f1335b693640760739c02e03/37931813032.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/64128040461.pdfIn PDF document text
    • https://mmszke.hu/files/file/2514808825.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5f919292b91895638b46360434650322/57062122066.pdfIn PDF document text
    • https://qnzar.com/files/gagunazewexovugegubizivo.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/javesofitamipafid.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914072955.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/nipiluj.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/musapaxubepazivujutujije.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/xomisitanedev.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/74077079962.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/91476208325.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/89013533406.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902074710805174.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/talurezarilunep.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/21389978538.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/40970538959.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/ruxowomerekepuwifivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mortal+kombat+subtitles+english+downloadPDF link annotation
    • 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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 16828 bytes
SHA-256: 908e70d4ac26a8cbcd9b1d3647d9ce54de1d0978006a9a2c3e9f3dda1d07c233
font_02_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 11108 bytes
SHA-256: 212e7f9b4f3e90d4b2eddda6a7b10c23215cc566810a44f1601ecb2ef90f7e02

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