Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80a776e8b94eee5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 06:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78042f034b31b33970532307b5dccee1 SHA-1: f1efcfe3a63844169133f8aafd9e3ee70430003f SHA-256: e80a776e8b94eee5a523fb32351b4844861966ab0e83c0cf536f8d83d948d408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links pointing to a variety of domains, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample.

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://fereshtegan.net/basefile/fereshtegannet/files/17447573251.pdf In PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/52127075391.pdfIn PDF document text
    • http://i-physiology.ru/upload/2125341408.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/finuxuviduba.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/15009917845.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/madepitinibubedodet.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/73043461376.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/semigewexikagokimarefab.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210920022348.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/rexutudawonofesal.pdfIn PDF document text
    • http://ministerium.pt/files/ragonexirowadetoje.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59808450724.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11085753404.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/50521415964.pdfIn PDF document text
    • https://somogyplusz.hu/files/54713697705.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/47050339235.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/ganemegibinobabolazus.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xukatumagunugaf.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83696bc359a3a10a1b87dcab39edcbff/53943672742.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5e8c8b5d0---sifexob.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/kebawinenamudurelafijaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+cross+website+tracking+chromePDF 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_off0000b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 10944 bytes
SHA-256: 77571c6e4d56f15066bb94d8e9a30186a8256a0eaff041e411d8f223eb6a198d
font_02_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 16880 bytes
SHA-256: bf0e5a0be5028fd7e233673b7716fd4a5a3918f69e619714aaaaf7021a73b5bf

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