Malicious PDF — malware analysis report

Static analysis result for SHA-256 97780898376145ea…

MALICIOUS

PDF

68.4 KB Created: 2021-02-23 10:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ef65ee7f9de6477d58c4681f21ae934 SHA-1: 7b9756e42a339fb2f685e89008fdcd17fc11f2dc SHA-256: 97780898376145ea1930260ed3b83c3e07df9f482179f424e7602d8db6e3417a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. One prominent URL, https://jacksth.ru/wb?keyword=fire%20camera%20mini%20hd%201080p%20camcorder, appears to be a lure for a product, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jacksth.ru/wb?keyword=fire%20camera%20mini%20hd%201080p%20camcorder PDF link annotation
    • http://itawegan.fun/nolawerufix4dw7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5ff76403b5580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fedca64b4641.pdfIn PDF document text
    • http://fineagencyy.com/89758586830ujnnq.pdfIn PDF document text
    • http://maddot.space/greatest_common_factor_worksheets_for_grade_5xblnd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_5fdbb21010952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_602fa0aae2975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_600b8edf23623.pdfIn PDF document text
    • http://avit0.cc/what_is_program_in_project_management84kxt.pdfIn PDF document text
    • http://shlifovka-pol.website/423871597082z47o.pdfIn PDF document text
    • http://jojiluvapesoj.22web.org/fanakasulijawipamuzuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5fe223fe6058b.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/vazisi/que_es_un_proverbio_chino_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/dutekovasavavinuloj.pdfIn PDF document text
    • http://zozasozam.epizy.com/fiery_furnace_toddler_coloring_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/fekezusezakoxonikulofu.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_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 5448 bytes
SHA-256: cc71cf2ef95857764772840ef44ebf9e46820fb50cd92db81755a42e5312813e
font_01_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 10860 bytes
SHA-256: 93b6c8a9bf272e606178bae7df7eb79d1fa5bfb6692f02c784c218045415f517

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