Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5ff58ef572ac5b…

MALICIOUS

PDF

98.8 KB Created: 2021-03-06 16:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af580eaab346575e00ea3e1422346e24 SHA-1: 15baa4eae97dea28c6859c67fa037ce9edefa892 SHA-256: ff5ff58ef572ac5bc095838cc2f8ad6e141ffa683e2ce4208537c71dc49845ba
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 0.9997

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://soxebez.ru/123?utm_term=jawbone+big+jambox+speaker+watts PDF link annotation
    • http://dikegebe.mygamesonline.org/vexasofalekenowupopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_6015ad9faeb97.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/3382488.pdfIn PDF document text
    • https://zoxexalibefan.weebly.com/uploads/1/3/0/9/130969973/vatuzugosuganimepoz.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/viwan.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/jajiwefegomeru-zoxudataleveta-suxokixasuw-kugeda.pdfIn PDF document text
    • https://dorewedekubur.weebly.com/uploads/1/3/4/7/134721360/3346955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_600e3e4623428.pdfIn PDF document text
    • https://piwobovolan.weebly.com/uploads/1/3/5/3/135388479/jukamib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5ff474da7b2d9.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/diditafujuk-mupureno-xisubuzirefux-kapabizovexumup.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/pebekoku.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/pofofojudoku-sopage-nuxedebi-sarufadarog.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/e3fe800a-0498-4a54-b1b0-0d117b8b420a/rebomunitobufoxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c857d9a7-1768-4304-9429-6f6962a00d70/singer_6235_bobbin_tension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94107e6d-c1a9-449e-b736-c538a9b2d825/toziboperekemugipupomuvim.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/how_to_reset_vicks_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d3ec20-c59d-4aa3-9725-3fd352a68f6c/11153757427.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/80383511556.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_57d1b0e0da0743c1a704ad9a34131ba9.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_bff3d56b137547e3bcae24f2907c0cd6.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_ba8d25d1bdcd4f9290e683803d102924.pdf?index=trueIn 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_off00014422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14422 5536 bytes
SHA-256: 4336314f3059846776b76b5ec65a85e3277d180ed57f627a87cbee3176de717d
font_01_sfnt_off00015704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15704 11492 bytes
SHA-256: ad569c8faefa58a7f9596c12df2e1ec95c122e08ee76b950dee3741a7f2699ca