Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b73b39cf954ae69…

MALICIOUS

PDF

45.7 KB Created: 2020-03-27 13:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3a7b55a641d2743dd51cef42ded8218 SHA-1: 5a8525728dd58c5c24729068ff815f72a69f4de4 SHA-256: 0b73b39cf954ae694c8560b2247c573945fb1e29ec6e659add1ded0ef97b62d2
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. These links likely lead to malicious content or phishing pages, and the sheer volume suggests an attempt to manipulate search engine results or distribute malware. No scripts were extracted, but the presence of numerous external links indicates a malicious intent to redirect the user.

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://oitocomconsultores.com/uploads/1/3/0/6/130620874/130620874.html#piebald+double+dapple+dachshund
    • http://moomoocow.maraludwig.com/uploads/1/3/1/0/131070167/1103888.pdf
    • http://bubbcomics.com/uploads/1/3/0/3/130313379/9598d.pdf
    • http://www.coatingovens.com/uploads/1/3/0/7/130740123/78021d7e4d8.pdf
    • http://bestvoiceforward.com/uploads/1/3/0/6/130605497/95bf9d9e77ab4c8.pdf
    • http://hopkinsbrand.com/uploads/1/3/0/5/130539846/zabuzop.pdf
    • http://momof3xy.com/uploads/1/3/0/7/130775334/510147.pdf
    • http://trecena.com/uploads/1/3/0/3/130323674/6b795b.pdf
    • http://fotohat.com/uploads/1/3/0/2/130292089/8b55c.pdf
    • http://www.valstandgroup.com/uploads/1/3/0/7/130776649/sokolareloxom.pdf
    • http://yeovilbeekeepers.org/uploads/1/3/0/5/130539843/d6d0f877.pdf
    • http://yourbrisbanechiropractor.com/uploads/1/3/0/5/130590689/kapubo.pdf
    • http://messageonoak.com/uploads/1/3/0/7/130739233/443694dd773de8.pdf
    • http://alexabowman.com/uploads/1/3/0/3/130312916/fodusumubupexifa.pdf
    • http://smartmobilityinc.com/uploads/1/3/0/6/130604032/bixopek.pdf
    • http://serverkoc.com/uploads/1/3/0/6/130603931/d058754645.pdf
    • http://myboomx.com/uploads/1/3/0/4/130483864/tepuxetajikafiro.pdf
    • http://bergvlietcongregationalchurch.co.za/uploads/1/3/0/4/130477083/nidafi.pdf
    • http://hostmaster.lizziehobbs.co.uk/uploads/1/3/0/6/130620877/xafak.pdf
    • http://jeltefaber.nl/uploads/1/3/1/3/131398541/1008115.pdf
    • http://translantau.transasiaseries.com/uploads/1/3/0/5/130539992/nevekurekelopow-xuxosipakufutom.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_off00008a78.bin
f0a02cc817525b387738e9392655bb1174233a394ea6832f4ef5d312a215b7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A78 8084 bytes

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