Malicious PDF — malware analysis report

Static analysis result for SHA-256 6943eb3032fcb126…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 22:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d57cd4fd9f51f82380664924bb43cd86 SHA-1: b867ca66bbddd180bcc96dbc337ffd52114cb5e7 SHA-256: 6943eb3032fcb126f2c74c6cae5e6c8a37ab4c0242685151f0d326075312c645
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting a campaign to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=contrato+de+arrendamiento+local+comercial+colombia+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5ff7767cc8eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fe78649436d8.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/marofapubovubode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_60241c0dddf8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fc574df8c2d8.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/17514858393.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/8933721.pdfIn PDF document text
    • http://pufegusikozig.22web.org/luzevupopenetaxirozad.pdfIn PDF document text
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/5807529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_601581825afa2.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/mujarurodovuluf_fovusasexene_rotagute_papasigivibek.pdfIn PDF document text
    • https://likuwamagu.weebly.com/uploads/1/3/4/8/134899286/6277868.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/8577105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600b2b0e4da37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fe7f11f266f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigonusotomofi.rf.gd/pa_school_immunization_law_report.pdfIn PDF document text
    • http://wokupepafi.rf.gd/58425052224.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/47734995261.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 5228 bytes
SHA-256: a8b55d33e9ee9e3139e3f66db9ad9c591e8899cbfbf921f52ebec098e51879a5
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 11544 bytes
SHA-256: e6aafeebb98ab25d8fbfbeb199c88d60db4cebe292cb683db4099c8863c94008

Open this report in the interactive analyzer, or submit your own file for analysis.