Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a07146a6de2d1f…

MALICIOUS

PDF

33.3 KB Created: 2020-06-06 12:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e665a6ae43023882b1e69e1f8c5b6668 SHA-1: db60d3bec96fc188cb997128950065c0367dee10 SHA-256: 53a07146a6de2d1f343af83f82d51e6366d7fb659d6c3435eb09f88f178b30cd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm designed for SEO poisoning. The document body, though heavily obfuscated, contains fragments of URLs and text that suggest it is masquerading as educational material. The primary goal appears to be redirecting users to malicious sites, as indicated by the PDF_SEO_LINK_FARM heuristic and the numerous unknown reputation URLs.

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://4k9.undesirable.us/uploads/1/3/0/6/130639419/130639419.html#esen+yay%25C4%25B1nlar%25C4%25B1+10.s%25C4%25B1n%25C4%25B1f+biyoloji+konu+anlat%25C4%25B1ml%25C4%25B1+pdf
    • http://scrivenerpress.com/uploads/1/3/1/3/131380440/dukekaradim.pdf
    • http://rttdrafting.com/uploads/1/3/0/5/130588487/jepar_worirusulage_dawusafigebe_bidejute.pdf
    • http://byemilyrose.ca/uploads/1/3/0/8/130814241/nonarojipar.pdf
    • http://tavijuarez.com/uploads/1/3/0/6/130621744/8a1cf5026829573.pdf
    • http://hierbasdelalma.com/uploads/1/3/0/4/130476237/24a8e03e6.pdf
    • http://thailoestudio.com/uploads/1/3/1/4/131407278/7636d1869e.pdf
    • http://wolfhavenfarm.com/uploads/1/3/1/3/131398197/6450961.pdf
    • http://wsociety.org/uploads/1/3/1/4/131453484/gepakanasozok-sefebigalibopuk-lawujogaxawim-xinijena.pdf
    • http://4k9.undesirable.us/uploads/1/3/0/6/130639419/terms.html
    • http://4k9.undesirable.us/uploads/1/3/0/6/130639419/dmca.html
    • http://4k9.undesirable.us/uploads/1/3/0/6/130639419/policy.html
    • https://paditiw.files.wordpress.com/2020/06/29131497946.pdf
    • https://desikamen.files.wordpress.com/2020/06/romafedomanawenoguno.pdf
    • https://rulesuwasok.files.wordpress.com/2020/06/29564196595.pdf
    • https://janivuveraku.files.wordpress.com/2020/06/57886379618.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_off000054ee.bin
5f148fa6e0f363550b69f3b0a421539af24d5420ac7963d65049749003d120cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54EE 10508 bytes

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