Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bceb82e52efaf4…

MALICIOUS

PDF

69.7 KB Created: 2021-02-18 15:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d628c4b7a03029f886930fb680c9a01 SHA-1: a7cef51f5eb6d4e0aa02066e8bb2da2cafd4f317 SHA-256: 47bceb82e52efaf4ddf1ccec5e9c0c84ce596521f5a16e7e370f0b2df4026604
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'jottigo.ru' and another to 'cdn.sqhk.co', suggesting a link farm designed to redirect users. The presence of these URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=clinical%20pharmacology%20jobs%20boston PDF link annotation
    • https://cdn.sqhk.co/regomesu/dgfgijj/53106386519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fce4e40e3da2.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/FsLejc2/weladuja.pdfIn PDF document text
    • http://websporizle3.com/samsung_smart_switch_mobile_ios_downloadac5fr.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/orden_de_un_polinomiogmly8.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/59354683824.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/UCjgCDS/free_printable_full_page_horse_coloring_pages.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/jawiw.pdfIn PDF document text
    • http://molotkov.site/words_of_power_damon_brand96gbo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014ff4b1ff2a.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ja8hd6r/97066595584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489975/normal_601c5bb840823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5fde81743c79b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/72831041723.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/xoxaxapaxepasuwevip.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/acca_p4_lectures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/7148348676.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 5568 bytes
SHA-256: 819014817df7c60bb4cb7203b7ff5493ca77bd588f1cbac74c1191cfe4fa66b7
font_01_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 11316 bytes
SHA-256: 56fdc9a8225360fc1d453080adfe0abbb42476972b5a5aa72489157e0da93f37

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