Malicious PDF — malware analysis report

Static analysis result for SHA-256 912c8202d86b3f71…

MALICIOUS

PDF

193.7 KB Created: 2021-06-06 13:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95ae852f65641e67fd6d1f5c5401e010 SHA-1: ada63dadac9cb797acb6c86912842cb2f56c8d49 SHA-256: 912c8202d86b3f71abd63b24ed54e22d460552657f8c25bf11454baf071440de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/pbw?utm_term=uk+postal+address+format+international PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fecf76c108f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fc5a19adf433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fc72104432ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_604211cfbea70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_604adc73e80a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_600c05392e264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_5fd8cb41794e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60317828ae388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tugewuvog.pbworks.com/w/file/fetch/144717177/pumofidumun.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/kuziruvasekitofezagabok.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/taylor_swift_google_drive_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead936fc-d330-45d5-a589-7b2932570d6a/39823312249.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144495819/casos_practicos_sobre_toma_de_decisiones_empresariales.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/90003513426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea04a79c-0435-4670-b787-425fbdd60804/susan_sontag_notes_on_camp_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d07575-3528-4d10-b08f-22324efab61d/52698286903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdf8b22-bcb3-4c3b-b898-441101080c97/judigap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1deb8a5-b857-41be-ab4b-86967868a50a/vemixajesekewukadawotozed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9da6f6-c895-431c-8460-4c3da9de837f/lg_washing_machine_manual_wt7100cw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683993db-7ecf-407b-b5bb-d40255b99a9c/tawivanolifavatomaxakalo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0002dada.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DADA 18340 bytes
SHA-256: a46e1b0ffb0ac732c4b23f83437379cee1cc9e576d663143d29031e506a145e7
font_00_sfnt_off000228fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228FD 27056 bytes
SHA-256: e451fb5552d51c486c0f42431095fffde88f6c9eddd59ae86975669aba6ba096
font_01_sfnt_off00027d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D75 5240 bytes
SHA-256: 43036356fac5bbd0392407a3af1a17941b2688b5cc831bbf8922a5472f6737b7
font_02_sfnt_off00028f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F38 29696 bytes
SHA-256: 9e0f5e26f679702b843434fa71621e2e01453117b8fb661389ed8ed88e912191