Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea095738fb5a3087…

MALICIOUS

PDF

71.5 KB Created: 2021-05-01 23:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dbb4de271e35c3935da16fc670aefd6b SHA-1: b6ede6d240eafc6acbb20eece784b291d3292f73 SHA-256: ea095738fb5a3087121df622c967ae500d62a0a5244574f10f4f033a10b1be5c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with at least two pointing to suspicious domains ('mezovuduw.ru' and 'gixuvexadagurux.22web.org'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm on disposable hosting, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic are sufficient to infer the attack pattern.

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://mezovuduw.ru/strik?utm_term=how+to+fight+a+dragon%2527s+fury+pdf PDF link annotation
    • http://gixuvexadagurux.22web.org/63201850120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5ff0ce375320a.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/after_series_anna_todd_paperback.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jjdmVgj/stickman_run_away_games.pdfIn PDF document text
    • http://pressit.space/rewigefaler9j3p4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fe6784e02a2e.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/pokufosupadaler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fcdddd866086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_6044a0c49dffa.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/write_a_personal_narrative_for_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421473/normal_6002c41f4e4da.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/O8diigh/52378560974.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/jgegjid/final_fantasy_13-_2_walkthrough_gamefaqs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389601/normal_5fe086dbc7475.pdfIn PDF document text
    • http://yourdesk.website/zesirumoxavemu7m78d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60112c5f5919e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futikuzita.onlinewebshop.net/49680454793.pdfIn PDF document text
    • http://wanabovemuzume.rf.gd/29188908786.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/merriam_webster_font.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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 5460 bytes
SHA-256: 8dec78b6089ccef88885d376108f5a16b13ffeb8df38661a5e063c3ad7037a9b
font_01_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10500 bytes
SHA-256: 9683eb6fa35767ea9ea40d74f9386ff0a536de1e7314047cb3555f0e73e55eb1

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