Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1e73aa9de9a6b2…

MALICIOUS

PDF

74.5 KB Created: 2021-03-23 15:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af53830ca5ce8c7e27da7e630e181346 SHA-1: 36a5be381677938c383ccf554b943627137c1d93 SHA-256: 7c1e73aa9de9a6b22742d26c1e7d1a7b1bf7de65198e3ff63189176ed4c6f511
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=physical+therapy+progress+note+template+pdf
    • http://fumigatoff.online/night_shift_jobs_north_las_vegas1rg54.pdf
    • http://summ-ita.space/swami_brahmanandasswh9.pdf
    • https://cdn.sqhk.co/xuluriwu/fWhaAie/resident_evil_afterlife_game.pdf
    • https://cdn.sqhk.co/roretuduva/hdieqdU/vegetable_chop_suey_recipe_sri_lanka_in_sinhala.pdf
    • https://cdn.sqhk.co/nesadatifu/hiYhjvO/twisted_tea_logo_svg.pdf
    • http://wirelessinfo.ru/the_republic_by_plato_book_2_summarynbx83.pdf
    • http://vitofemegawe.getenjoyment.net/biodynamic_organic_and_natural_winemaking.pdf
    • https://cdn.sqhk.co/geroterunetu/eFjaS6P/74744458419.pdf
    • https://cdn.sqhk.co/pemejurove/oDjhhbk/benokixizug.pdf
    • http://gradstroy.su/bike_game_hdag8vn.pdf
    • http://larekew.mywebcommunity.org/67101665746.pdf
    • http://esmoney.site/laxasixezikinusigjc5w.pdf
    • http://nadipewin.mywebcommunity.org/41787875791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kikukuvikato.myartsonline.com/editing_documents_in_windows_10.pdf
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_2c99d85688c3490c9319d2ca943b6fb1.pdf?index=true
    • https://s3.amazonaws.com/julaxel/inspector_general_report_on_stellar_wind_program.pdf
    • https://s3.amazonaws.com/nitirew/lewis_dot_structure_hcn_formal_charges.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_00e23e612e4a4db583d0dee5b01e482a.pdf?index=true
    • https://s3.amazonaws.com/ganubatebedoxez/kolabudatora.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_5eeff3e8cbec4448b761fa74cb9bda10.pdf?index=true
    • https://s3.amazonaws.com/nitatotol/whatsapp_plus_2018_version.pdf
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_82ec4d22bd88483c85c10702e6a6580f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e364.bin
3dd5c90b6dcfd92f4d7c9aca549aace55455e20502490f09b2f4118a5fefbdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 5672 bytes
font_01_sfnt_off0000f695.bin
6c542e0652bed43b354ebc1c6174e17c5875c8aeb92e028572d8358666a06b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10536 bytes

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