Malicious PDF — malware analysis report

Static analysis result for SHA-256 8240f98cca20d30b…

MALICIOUS

PDF

37.3 KB Created: 2020-06-12 05:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 191f34558b247cdfe19ea96e80f50247 SHA-1: d94f020cb438c498577f022513bc43f8932fd4a5 SHA-256: 8240f98cca20d30b357b50c49bd3040b71bca0dacccfacb3d5abe4aa22e1b74d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the structure suggests an attempt to manipulate search engine results or redirect users to potentially malicious content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://kelbels.org/uploads/1/3/0/4/130436074/130436074.html#saxon+math+online+worksheets PDF link annotation
    • http://orliconsulting.com/uploads/1/3/0/7/130739536/1b045.pdfIn PDF document text
    • http://ccamsolutions.com/uploads/1/3/0/5/130543569/ludadiniweki-bireg-raputo-nijoriwowubix.pdfIn PDF document text
    • http://betteryouhealthgroup.com/uploads/1/3/1/4/131410818/xawemurekoboxot_tobubuluratud.pdfIn PDF document text
    • http://thepizzaplaceandmore.com/uploads/1/3/0/7/130740001/madelesalaxubidi.pdfIn PDF document text
    • http://royalsingalongparties.com/uploads/1/3/0/7/130739772/lawiwinovubiju-vijopo-kovurajifefa.pdfIn PDF document text
    • http://spuggey.com/uploads/1/3/0/7/130775987/3702523.pdfIn PDF document text
    • http://ebricksandmortar.com/uploads/1/3/0/3/130379482/9246293.pdfIn PDF document text
    • http://shanenvyhair.com/uploads/1/3/0/7/130776385/keladixuv.pdfIn PDF document text
    • http://wealthmgmt.solutions/uploads/1/3/0/6/130639269/gekova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sujotupuro.files.wordpress.com/2020/06/67640385982.pdfIn PDF document text
    • https://puxeter.files.wordpress.com/2020/06/87797779300.pdfIn PDF document text
    • https://jedujasug.files.wordpress.com/2020/06/pesinuk.pdfIn PDF document text
    • https://xumitepobeba.files.wordpress.com/2020/06/53117996447.pdfIn PDF document text
    • https://zugomesemuz.files.wordpress.com/2020/06/fedixiwugot.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EC 10240 bytes
SHA-256: 1bb3720a43a8ac2fd8578cca3fad499514d40f2550179ee14fbc99b2c3938361