Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f81435a9572cb79…

MALICIOUS

PDF

90.6 KB Created: 2021-05-11 02:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d7808f522d9f16f0afb576b6c52ddf6d SHA-1: f2a72ca4b5b20cb22aa8c153a59929087db7dfd6 SHA-256: 0f81435a9572cb7988f7028146ed7a11bec0c7aba9a12e264001e77ec7ba3b5b
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 0.9992

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://crophysi.ru/strik?utm_term=dunkin+donuts+iced+matcha+latte+caffeine PDF link annotation
    • https://vusukiziroge.weebly.com/uploads/1/3/0/9/130969505/petedanitotaz.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/jusobebumamili.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/bonang_mohale_book.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/785335.pdfIn PDF document text
    • http://luwazesoj.22web.org/lajavapokagukigedotu.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/auditoria_de_sistemas_informticos.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/nufona_wefularabajaruz_zapogoxuzibo.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/ragumuj.pdfIn PDF document text
    • http://tryici.xyz/brother_mfc-j825dw_printer_wont_print_blackas1rh.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/lavuwozosab7wbvb.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/derefarisufi.pdfIn PDF document text
    • http://top-agent.ru/python_dictionary_comprehension_multiple_keys4hzio.pdfIn PDF document text
    • http://microdigitalmeter.xyz/suradotizamemawadoda9ay8o.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/anglo_american_literature_history.pdfIn PDF document text
    • http://xakavewazoxejef.22web.org/articulos_cientificos_de_psicologia.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/setodigutezipup-bemaverawisa-mazanaxusukov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2e6760-1c15-405c-a2f4-9d655197b9c7/does_target_sell_dehumidifiers.pdfIn PDF document text
    • http://bapadukaf.epizy.com/calendario_aprile_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615ce796-49a4-4896-9969-2bec7530e241/sajoketabotubimufozuwofu.pdfIn PDF document text
    • http://lejugolidisixod.rf.gd/52803589371.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/67644172419.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/35707501498.pdfIn PDF document text
    • http://kudogal.rf.gd/30034612578.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_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 5228 bytes
SHA-256: 846767e730971756e40ad94ae22c38ff5c6b03760422d00b8cbd6bbe5b9026d0
font_01_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 12636 bytes
SHA-256: 9b96662d268281ba716cc35ef41be6a05cbb227c4bf389a34efa7a6592cded14