Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b23c38f574cb1c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 18:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6edde582762ba247798a31a90ac553ae SHA-1: 79eb41180b6f16dfa7577922f8d37bca9a978c62 SHA-256: d7b23c38f574cb1c4bdd324a9c850cb1de0fff8f8f7cee1dad30533ec6c41466
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=ultimate+guitar+tabs+apk PDF link annotation
    • http://yevres.fr/ckfinder/userfiles/files/tojefom.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6999239248.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/donaw.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/rerudezemeluju.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/koxejemebi.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/97560885248.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c13079b55---9127397803.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kfvk273pghfputge6vvgkctup1/golozu.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/darorufibunotasoweba.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/14233368905.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109060549127783.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021918422503108.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/garefojevuxidawevase.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210904024850247.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/86087858973.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/sazeweribolagigitoju.pdfIn PDF document text
    • http://potlista.com/file/files/13166509495.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/16318601777.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/bewifotun.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/27071086371.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/97952193276.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/tanimodi.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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 17716 bytes
SHA-256: 302db3db86aad117e9882432a00c5eb0708521b97479661bb03c871bdc6bae77
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 10712 bytes
SHA-256: 672712fd6dc2660673e0fd5854cc4e5e44e2a8a0d1cb8b97adfefb87a0d24c0e

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