Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcf4bd096d5e425…

MALICIOUS

PDF

80.2 KB Created: 2021-06-11 06:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b08d1cf9e159399e43522a7db65b251 SHA-1: 862639333248305a154ab852e25a71063e69d6f9 SHA-256: 9dcf4bd096d5e425b93656cc6a84c7afc154634cb6afda077a830acfb0dd9f07
126 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links disguised as an audio song. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, and the ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://botokaw.ru/123?utm_term=angana+padharo+maharani+audio+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447464/normal_605966efd998b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5ff41807121fb.pdfIn PDF document text
    • https://katutufoderosut.weebly.com/uploads/1/3/1/4/131437544/vikululumisewixodisu.pdfIn PDF document text
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/27ad270eea81.pdfIn PDF document text
    • https://xisobapujizutu.weebly.com/uploads/1/3/4/5/134585888/xexuduwalol-fimes-vefagufidabuj-fovebobego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_60359e581fba2.pdfIn PDF document text
    • https://tufakuxumiwe.weebly.com/uploads/1/3/1/4/131454237/xolebubexusesuk.pdfIn PDF document text
    • https://nojokubovurob.weebly.com/uploads/1/3/1/6/131606526/bezepodux_vutedujukud_piriwofike_kidariri.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/e84d91b049c6.pdfIn PDF document text
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/xevigerasow.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/tederujokamikijuvu.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/4987811.pdfIn PDF document text
    • https://bewupisobafa.weebly.com/uploads/1/3/5/3/135340617/raxebed.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/4350991.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/3571509.pdfIn PDF document text
    • https://nawajago.weebly.com/uploads/1/3/4/6/134621860/fakimosoj.pdfIn PDF document text
    • https://gazavado.weebly.com/uploads/1/3/4/3/134331045/fec11.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/8901636.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/jitamuv.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/3288771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fcb156da9a04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144513291/call_of_duty_mobile_hack_uc_apk_download.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144473673/21693116862.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/f/sejiwizuwukobolumaju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 5332 bytes
SHA-256: 2590e9cb67ab3d53d12e14853251a1e62b789d03c02b48c1a8f82a566dad88c6
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 11024 bytes
SHA-256: 1aa6d3ed0a1714dfa8350ffdc10d966d43e2883f2dd7b86015a9bf1f16a19411
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 4516 bytes
SHA-256: c38e787b7d7b9557c9c23156dd06a9869f616a0c1ebffdb9d1301f73255372fa