Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fe7a0d0c9da737…

MALICIOUS

PDF

78.3 KB Created: 2021-03-27 22:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c954e1b102ba84dd397f7e2e0f4ebb9a SHA-1: 4ef45e72144517b967870462d8e4d876b67ebf57 SHA-256: a4fe7a0d0c9da737b2f2687ed9a741462462fe6dcd8b40dee94dbe27b5ce656c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The document body, though heavily corrupted, suggests a lure related to 'study guide polygons and quadrilaterals', which is likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=unit+7+study+guide+polygons+and+quadrilaterals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383566/normal_601ae01c7e893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_604508304ed30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5ffe4464a6cef.pdfIn PDF document text
    • http://idealicacolumbia.site/52492270322opvts.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/liduvaresawes.pdfIn PDF document text
    • http://erethiztzj.space/rowetupojvn1.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/konflik_ahmadiyah.pdfIn PDF document text
    • http://farvestnn.ru/download_leapdroid_full_versionfc7lz.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/runolomogalebotusova.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/sbi_bank_clerk_book.pdfIn PDF document text
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/99670b399cf.pdfIn PDF document text
    • http://ubsvp.com/tubut3i2ia.pdfIn PDF document text
    • http://lnstagramsupportlives.com/free_ringtones_for_apple_iphone_xrmxt96.pdfIn PDF document text
    • https://botuwuroxawezu.weebly.com/uploads/1/3/4/7/134713501/xuviduxa-nosagolunirino-fagazodik.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/1c309bb8cc1.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/qamri_calendar_2020_pakistan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_601295c8eebae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_6053c4e1c3ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5fdfd3ae158e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_e3870fef3e3a47e085d2bffab67c951e.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_ff6b2c1d358942889070c2d287abcd5e.pdf?index=trueIn 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_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 5428 bytes
SHA-256: 96c926ace42d20a89a386dadbb887a0565db52f4a4268327960091996e355113
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 12060 bytes
SHA-256: e7c87bf9a12d3e5723984c70992f629b9aae87d2b8fe4d6de9308034f5b5d6b0

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