Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ff03bf6912218c…

MALICIOUS

PDF

66.8 KB Created: 2021-02-17 00:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c59d95862d6f2322fa1e19b41540d7df SHA-1: 59ed83b67f70e7419148d0798239f6c7e980ed4b SHA-256: 09ff03bf6912218cef71cc521e6c7801e3b67eaa2677017d20456de2caa7fa4e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

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://seumenha.ru/wix?keyword=law+of+supply+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fcaa3d0cac76.pdfIn PDF document text
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/6376358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_5fd6c59b91cf6.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/275377e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_600f12f52b2fd.pdfIn PDF document text
    • https://lebudikex.weebly.com/uploads/1/3/5/3/135310552/vuxomaw-xibub-lobuv.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/2984690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6003c1da12d81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5ff7f47c47c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fe8ee5d29cb6.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/pululusodogi/how_to_block_phone_numbers_on_android.pdfIn PDF document text
    • http://watosoxugulufi.epizy.com/wallpapers_hd_for_mobile.pdfIn PDF document text
    • http://xofiketur.rf.gd/47228529934.pdfIn PDF document text
    • http://gudirazopusexi.epizy.com/78597908757.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/arch_linux_desktop_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/ldr_darkness_sensor_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/11431764370.pdfIn PDF document text
    • http://pexitiwe.epizy.com/cause_and_effect_worksheets_for_third_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/sufus.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/rental_property_expenses_spreadsheet_template_australia.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_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 5328 bytes
SHA-256: b8c58c2e095c09b4c15414766f79966575096f19a4133e4735ccf654c725f467
font_01_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 10248 bytes
SHA-256: a0d74e580db515510cbf4639c2f25b7dd0e887ecefb1919bf2716a9acb676f2f

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