Malicious PDF — malware analysis report

Static analysis result for SHA-256 2faa2c1cb81cacb2…

MALICIOUS

PDF

34.3 KB Created: 2020-06-12 15:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e545d7fa1290809cf46ba27aec394073 SHA-1: 677cb027a4fde7706660fa39bde48360cf720888 SHA-256: 2faa2c1cb81cacb21661057a057295919abc5867cb781d26460a24a17a6f50e8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, many of which point to domains that appear to be part of a link farm designed to distribute malicious content. The document body, though partially corrupted, contains text suggesting adult content, which is a common lure for distributing malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, likely intended to redirect users to harmful sites.

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://tigersg.com/uploads/1/3/0/6/130604314/130604314.html#Dessins+anim%25C3%25A9s+%25C3%25A9rotiques+japonais
    • http://gamingaccessoriescentral.com/uploads/1/3/0/7/130739584/takoponelovowizekuf.pdf
    • http://wagenselleryoga.com/uploads/1/3/1/0/131071057/2346635.pdf
    • http://inhissightphoto.com/uploads/1/3/0/7/130776781/motisiwes.pdf
    • http://rainerandbear.co.uk/uploads/1/3/0/6/130621203/tujarogujenebi_jurazit_kikixobufisa.pdf
    • http://ns1.skaitube.com/uploads/1/3/0/6/130639114/tatuzojivaxit-ramobok-futaranuvexo.pdf
    • http://callahanbrooke.com/uploads/1/3/0/2/130288798/1801597.pdf
    • http://pcfencingcenter.com/uploads/1/3/0/5/130544118/raxuwirejowad.pdf
    • https://lasewodaba.files.wordpress.com/2020/06/51421473248.pdf
    • https://funegoj.files.wordpress.com/2020/06/84491971029.pdf
    • https://pafinomoj.files.wordpress.com/2020/06/17467876817.pdf
    • https://pomosoku.files.wordpress.com/2020/06/22122903132.pdf
    • https://bilavumumu.files.wordpress.com/2020/06/wafega.pdf
    • https://lowudozid.files.wordpress.com/2020/06/73606723191.pdf
    • https://xowosono960427342.files.wordpress.com/2020/06/widubapenux.pdf
    • https://xibelilunaf.files.wordpress.com/2020/06/37379627327.pdf
    • https://migosefej.files.wordpress.com/2020/06/demaxazevowilupujizigep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000559f.bin
08c6e1477668efc36efaddd2ea3aa1d0e366ba36ad3e230b381071227b75c64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 11732 bytes

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