Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ec3a0a21d1da96…

MALICIOUS

PDF

70.6 KB Created: 2021-06-03 23:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8b742a45a5e6d81b229d3d727e43fb21 SHA-1: e5dd55749c38ef59364ba25ae549ee1d3fe79575 SHA-256: d3ec3a0a21d1da96c9e5abfbf25e5926ca94d31225f23cba5560b0d14bd43669
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=minecraft+skin+template+fortnite PDF link annotation
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/buvogazibowip.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/681888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_60693881bf0a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373504/normal_5feccceb233fa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405899/normal_60b2a79f5339b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_6028fff1ac8c3.pdfIn PDF document text
    • https://beripetalodewug.weebly.com/uploads/1/3/4/8/134865824/mugowagovixete.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/8901892.pdfIn PDF document text
    • https://gugedawojovo.weebly.com/uploads/1/3/4/5/134590720/ladag-sigamalo-mifutolalipuk.pdfIn PDF document text
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/remesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_60565e3f8b9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_600ff8aa82cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_601f82e92dee0.pdfIn PDF document text
    • https://jesaguxofugu.weebly.com/uploads/1/3/4/6/134659129/e9bcfc4680b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369524/normal_6000395f55dea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwofig.pbworks.com/f/kabujokutigojezabi.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/qui_es-tu_roi_dhumilit_paroles.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/pokemon_super_mega_emerald_rom_free_download.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144498570/how_to_get_a_class_c_drivers_license_in_illinois.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425397/presidents_choice_5_cup_coffee_maker_manual.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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 5228 bytes
SHA-256: 94699b96dceb99b3be2deb60912357150e7299bddbfb83785f34e90e3146f2f1
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10212 bytes
SHA-256: 77b75254d76ad5f41fdda7e0fb6dfa21007fa61e6ad3b6baed5b696084a25e1d

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