Malicious PDF — malware analysis report

Static analysis result for SHA-256 b517591dcf808cf5…

MALICIOUS

PDF

77.8 KB Created: 2021-10-08 03:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c54f7b68904762d7777b3e0e33b0edc1 SHA-1: 0b9398ceae93873221002a8a81c58aecf7b0aab9 SHA-256: b517591dcf808cf5a82a718292e4f420cd16a79a7493aeb39fcb4f7b3a7edb88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one specifically identified as a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URIs are indicative of an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=laser+peripheral+iridotomy+side+effects PDF link annotation
    • http://bubb.cn/up_file/file/23467089048.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/43334836375.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/13201537035.pdfIn PDF document text
    • https://mmtours.si/uploads/ruwuwejinawuxodafi.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/71198724198.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/jamiserij.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/kesofaxuwisarewubub.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/90614580671.pdfIn PDF document text
    • http://gardatrans.com/content/Files/19191788487.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/54314230749.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/17296534282.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/xumitodoseriza.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/33442049087.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/reweboxukedenerik.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/13021930478.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/xusamologa.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210918_2E42C37A219E9A8C.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/33175254528.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/gapilewezojet.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/25e376a602f88a8d768fb22d1d26a0f1/lojelexaxetipox.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/kikekanetupexep.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f2ddd66881---31391254809.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 17992 bytes
SHA-256: 0daaa81d8baa45b0f66efd17f9eb65bc6a8b73b6d72540bf9ef3793c50bc0286
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10852 bytes
SHA-256: e2b91b885bb7eaae89899c0b376c9e5c491a48b9e7d48aef61c2433d95ec8d45
font_02_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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