Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d042b9d0557b3c8…

MALICIOUS

PDF

82.2 KB Created: 2021-03-02 18:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e14ac6604f15b08789f25231ff6a2971 SHA-1: 786f2d1a123795f92fb3236310d0799621e7a82b SHA-256: 5d042b9d0557b3c8f5107e3508bb40fdd0e7f42eb8d15c56af658afdf1c2de01
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of external URIs suggests a potential for further malicious activity such as phishing or malware delivery.

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://bologen.ru/123?utm_term=uv-5r+radio+fm PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ff608459db97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5fe3747ec065e.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/sonobedezifurusumukafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6037bf6424e31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5fcefda549e3e.pdfIn PDF document text
    • http://kuziluzesoga.22web.org/california_love_remix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6023d287dbba6.pdfIn PDF document text
    • http://kersita.fun/how_much_is_premiere_pro_a_yearl1fn7.pdfIn PDF document text
    • http://eduha.online/81818219499qqz6y.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/tegukepi.pdfIn PDF document text
    • http://sibuvre.com/google_sheets_increase_column_width81ffu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulixuvomewono.epizy.com/monoblastic_leukemia_case_report.pdfIn PDF document text
    • http://rujesuluxure.rf.gd/avatharam_songs_free_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/terrorblade_guide_dota_1.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/game_guardian_apk_73._1.pdfIn PDF document text
    • http://vigevelo.rf.gd/casio_fx_991_es_plus_user_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_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 5052 bytes
SHA-256: 3f03153ce4c0a489fe5ead1cc4c0bee3fd817a725550820d7e2dfd1e924c1310
font_01_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 12616 bytes
SHA-256: 6630ea3fde95a2f308d69da0cbc45babc637f3e2361205a10551a2722489cfad

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