Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c073262ad178d28…

MALICIOUS

PDF

72.5 KB Created: 2021-02-23 16:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b51a74e1fc9082b307eb77fc3e5e82bf SHA-1: 49a7b56f7b3e28a6d52a640b129f5e5ffb886ae9 SHA-256: 9c073262ad178d28b3f4011c3a975082deaf24ab2c0efd1cbccdb64e3173786d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The PDF structure and embedded content are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=d%2527evelyn+high+school+graduation+2020 PDF link annotation
    • http://kernig.online/kick_the_buddy_2_mod_gamerc54b.pdfIn PDF document text
    • http://galoomer.online/motion_graph_analysis_worksheet_answersovqng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5ffd0cd455dc4.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/equation_into_slope_intercept_form_converter.pdfIn PDF document text
    • http://relax35.ru/4043077448ft7fc.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/6141013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_60118970c4dbf.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/gFgjgct/dark_days_zombie_survival.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_6023f66bf1c98.pdfIn PDF document text
    • http://fepasorugon.22web.org/31092861044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_6007365c5abb6.pdfIn PDF document text
    • http://gtomishebs.xyz/refraction_of_light_quizbydx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepurudevivo.rf.gd/kunemanetuvetevozilopu.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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 5668 bytes
SHA-256: b544dc5842d66251ec5490d6b63aef309b2b3ddde8ecbc5ef5da1a661563aa27
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 11060 bytes
SHA-256: c16b4d3a0411e9831bacb9566645b61f6313b03f49f205c36d6bfbae3e6c62ba

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