Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff2bb4afb2977b…

MALICIOUS

PDF

67.6 KB Created: 2021-09-30 10:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7af4563285e26c9ba4e97a70fea67c8 SHA-1: a180e56656544c146f9778fee7180c08348b3333 SHA-256: 91ff2bb4afb2977bbe73803e9c959a7da77d8caa94602cfe404e245600610be7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bipalisdemo.dashindonesia.com/userfiles/files/54565678664.pdf In PDF document text
    • http://k1a.ru/images/files/file/81432728419.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/26352832478.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/41173244391.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/71395052954.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/35220080420.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/viregi.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/46975331327.pdfIn PDF document text
    • https://actor-conseil.com/files/file/linezikek.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/salopekupidepit.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/modog.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/48196196660.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/ridanavap.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092013495010.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/gutuneloxido.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/fijase.pdfIn PDF document text
    • https://samudra99.com/contents/files/47255434528.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/52651767345.pdfIn PDF document text
    • http://carbontuning.ru/file/mekobijafezixagina.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xakuzamakosuzibika.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/rimepuxokitaboxojadawobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+purple+oil+paintPDF 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_off0000ac7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48F 14620 bytes
SHA-256: 2830c1537e54aad769d78b9c46dbfdd15ddf2196d1f4b2685d5eb2114a1454a9
font_02_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 10516 bytes
SHA-256: 4d675f793761cb9da0cd938eb2aa987bc00ec50deb2433ae346d46fca8489d3f

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