Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2efa92ebb9da5b0…

MALICIOUS

PDF

66.6 KB Created: 2021-02-21 15:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6469eebe9cb771fd4ff4599f7664fedb SHA-1: 92dfb3173ee18279337da153131cecf1cf6cca3d SHA-256: a2efa92ebb9da5b080f6ab871d38496f3894b9bd53735fdf2be882b3c7736f02
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' and a keyword suggesting a lure for educational content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a network of sites used for malicious purposes.

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/wix?keyword=potential+energy+diagram+worksheet+answers+chemistry+if8766 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5fcfe6094a84f.pdfIn PDF document text
    • http://presentinsta.online/gafuwurabecclhc.pdfIn PDF document text
    • http://teasmall.space/ballet_de_venga_la_alegria_nombres_completosurkfy.pdfIn PDF document text
    • http://tukameduk.22web.org/battlestations_midway_xbox_360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_600d4bc25f731.pdfIn PDF document text
    • http://auto-agents.space/color_balls_fill_3d_bucket_fill_challengesmlbex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fcc943246245.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/satuja/90267119960.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/41228592749.pdfIn PDF document text
    • http://paravewufazik.epizy.com/56624113002.pdfIn PDF document text
    • http://baxajuzurajuj.rf.gd/joe_mettle_turning_around_song.pdfIn PDF document text
    • http://bajipogijos.epizy.com/pandora_bracelet_safety_chain_size_guide.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_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 6124 bytes
SHA-256: 09c5256bf1e1f3539962b8203d4c38a29f6adad96e80644d97111d0c5dbc2261
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 9888 bytes
SHA-256: 2929b6c2f042fb9a06fbe34aca86252fb79a4c7a249367ba98d5dd84235f3237

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