Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8bd2978ac41270…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 05:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6322de24fc6ce1d5df0f9f9ade52f368 SHA-1: 4895d0657f4597ef33cb8a81bb792ef0e5fd6d29 SHA-256: 2d8bd2978ac41270a1766f91f7088fb3dd8eabba2b6a3dd9a4973fcefee2b506
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification indicate a high likelihood of malicious intent, possibly involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://odpadykj.cz/UserFiles/File/95398066350.pdf In PDF document text
    • http://cityclick.it/userfiles/files/gerizeretevemusu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/16810219186.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/fogasigamuzogexijojamuj.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/16314510995.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/13826484639.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/85489169135.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/53719997639.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/78962447659.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/81255559797.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/77642301442.pdfIn PDF document text
    • http://cl-pub.com/files/files/gajejofololobusisupovu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/71710956793.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/sadelaninaluk.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/56254914471.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/firamunozaxesivumobenop.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qqur3psptv3m5uu86smte2mcnm/xesagagatug.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/19905361790.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/1875385902.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/nonefofizamawunajopi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/683aeca600a018a870e046cf204f2286/76236803294.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907153231.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/lulawuloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=imikimi+android+appPDF 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_off0000ad74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 15108 bytes
SHA-256: ec013d59540033cff5123daf6a943486a17d2da742e964bdf659c7f03dbf000d
font_02_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10152 bytes
SHA-256: cdaca5af4fa4a3aa4eaceaa4009fab66800c03d75020a507c4dacb5adf1a4b42

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