Malicious PDF — malware analysis report

Static analysis result for SHA-256 d906f09c0c8ded6f…

MALICIOUS

PDF

72.6 KB Created: 2021-06-03 13:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9989b90c7a85d91fe60d22d93e57d761 SHA-1: 70e80135a62113a51e33d8e31b5b8407a3fad826 SHA-256: d906f09c0c8ded6f573dd6fcb4d0bcf39c4694576efb51f9d2dc71ae0d723114
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=burrito+bison+mod+apk+everything+unlocked PDF link annotation
    • https://dubutabinagi.weebly.com/uploads/1/3/4/4/134441981/rijugomot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_603cf07547877.pdfIn PDF document text
    • https://kijaxezadu.weebly.com/uploads/1/3/4/5/134590125/5867996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_60179df0dd9f0.pdfIn PDF document text
    • https://juponujebiz.weebly.com/uploads/1/3/4/7/134773331/88b8c6f2b99b219.pdfIn PDF document text
    • https://sedaduvu.weebly.com/uploads/1/3/4/5/134598683/848513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_600024f7a1933.pdfIn PDF document text
    • https://zewogamiwivu.weebly.com/uploads/1/3/4/3/134313422/wibokuxoma-fukag-gebenoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5fc59b081434d.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/0d2d7562-dd70-4ce5-9736-659ae7ab870e/nusitiledalol.pdfIn PDF document text
    • http://numefen.pbworks.com/f/fivafuwotokakuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fee0a8-fbd8-48f8-89e7-c96b9a7d9e2e/zusuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98c775b-254d-4d72-a9c9-187c0201f61e/fichas_de_trabajo_para_primer_grado_de_primaria_matematica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04761df-0bb0-45ef-9ce8-062515f306d1/27272537848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27733b65-fc17-44a3-80e5-f1192fc7a1b8/falonuretunozapajizaxo.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144423423/dapinivobububovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb013a0-9331-4fb8-ae59-2a7081879039/pioneer_stereo_says_amp_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cf2d01-f3ef-4aa5-98d8-dca38b40b0db/translation_maths_worksheet_tes.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144425880/abstrak_ng_pananaliksik_tungkol_sa_droga.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144450621/descargar_120_dias_de_sodoma_pelicula_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7f0410-c4b4-4a8d-8dfa-63b9e0c149bd/lusokod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7bf568-8b9e-4d28-bf43-e9d41183c1b4/fubumirotixiwiwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7858d6-5db2-498f-8546-365043f14ca4/ms_dhoni_full_movie_hd_1080p_download.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/f/78771718843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bfe19d-d91f-433c-944f-c876b0146729/popozirozaxitilibadeb.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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 5904 bytes
SHA-256: c7a1b5ba9848125eb9f5dbe0eadc4760e0a2b486b178ec56cc950e216651e126
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10608 bytes
SHA-256: 28c5bfc518a673914f2f63359d633c3cd1bb582d4d7e5a9628ca09dc5fd5046b