Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf6f957cbc798a6…

MALICIOUS

PDF

43.7 KB Created: 2020-06-09 23:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 59538cb2f0a5860ce45ce7116d601f25 SHA-1: 5e75ca72e7c8a2a450f3950235188bc07ac06887 SHA-256: caf6f957cbc798a623db7482d8c43f8ef0433fdd2e32e5ca420c6ce06da1005e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. The document body, though partially corrupted, suggests a 'diagnostic evaluation' lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a critical finding of mass external PDF links, with the dominant host being kristenconley.com. The embedded URLs point to various domains, likely serving as landing pages or download sites for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://stokesed508webpage.com/uploads/1/3/0/2/130289443/130289443.html#avalia%25C3%25A7%25C3%25A3o+diagnostica+6+ano+matemati PDF link annotation
    • http://kristenconley.com/uploads/1/3/0/4/130436426/1665349.pdfIn PDF document text
    • http://glamglittertrash.com/uploads/1/3/1/3/131380596/lexojubajitusutifux.pdfIn PDF document text
    • http://eabhyaas.in/uploads/1/3/1/3/131398022/78e4ad7.pdfIn PDF document text
    • http://outletfilters.com/uploads/1/3/0/5/130590241/e87d383f3.pdfIn PDF document text
    • http://completeprovidence.com/uploads/1/3/1/0/131070456/9657362.pdfIn PDF document text
    • http://bjjbridgeport.com/uploads/1/3/1/4/131482992/b0f70629.pdfIn PDF document text
    • http://gop.ncgop2.com/uploads/1/3/0/2/130288861/4248400.pdfIn PDF document text
    • http://katletki.com/uploads/1/3/0/6/130621238/jixipikiguware.pdfIn PDF document text
    • http://fifthseason.net/uploads/1/3/0/7/130776225/nivevilali_dazamowupuxe_popafe.pdfIn PDF document text
    • http://kishkoinc.net/uploads/1/3/0/5/130588511/0402911f416.pdfIn PDF document text
    • http://thekairoscentre.com/uploads/1/3/1/4/131455398/vewepazijulapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mipezidukona129768401.files.wordpress.com/2020/06/gavadelavulipulomisalamax.pdfIn PDF document text
    • https://fusikazisome.files.wordpress.com/2020/06/50226256917.pdfIn PDF document text
    • https://sebakeropi953133814.files.wordpress.com/2020/06/totapebonemogisemaf.pdfIn PDF document text
    • https://bopametipez.files.wordpress.com/2020/06/2797864505.pdfIn PDF document text
    • https://banibejazona.files.wordpress.com/2020/06/xojesoxiguxege.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9F 12312 bytes
SHA-256: a1d7a87ded16b317c0d59276b3ad91964c5507f11ab83faf1ccbf5795055966d

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