Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d899f309928d86a…

MALICIOUS

PDF

44.5 KB Created: 2020-03-08 07:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f38b5606d6c63b04230c88b695c06aed SHA-1: 2328d7743f319d82853bd7f31a82a298ff9c2c73 SHA-256: 5d899f309928d86a9e6fd6d653adaf486d7fc8fd8dd2d7e94104e000958815d6
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links pointing to external domains, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure to a secondary stage or malicious content.

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://74-123-77-212.mgwnet.com/uploads/1/3/0/9/130969555/130969555.html#combining+sentences+using+prepositional+phrases+exercises
    • http://kweku.info/uploads/1/3/0/7/130740062/1c95403079c.pdf
    • http://consensual-hallucinations.com/uploads/1/3/0/7/130738933/748331.pdf
    • http://marisabolson.com/uploads/1/3/0/3/130324136/sefesebiwuzerijuroz.pdf
    • http://mgracetransitions.com/uploads/1/3/0/5/130539923/sidofatasejitu.pdf
    • http://michaelmkrueger.net/uploads/1/3/0/7/130739376/zedugipevadasisa.pdf
    • http://laihlasmum.com/uploads/1/3/0/7/130775724/2991615.pdf
    • http://unutma.com/uploads/1/3/0/5/130541803/2aa363efa6c.pdf
    • http://kadampa.club/uploads/1/3/0/6/130620795/8165447.pdf
    • http://beccacook.com/uploads/1/3/0/2/130272918/7d090e2d.pdf
    • http://nuditosytrapitos.com/uploads/1/3/0/6/130639895/sezoguwazanoro_muvideke.pdf
    • http://natashakempthorne.com/uploads/1/3/0/2/130288549/80344f.pdf
    • http://www.carpentryreading.com/uploads/1/3/0/7/130775974/8880f2e599717.pdf
    • http://bockmannuk.com/uploads/1/3/1/0/131070148/tariditov.pdf
    • http://tlceducationalservices.com/uploads/1/3/0/5/130539059/739f2615.pdf
    • http://newglasgowmassage.ca/uploads/1/3/0/5/130588675/5bea7b95316c.pdf
    • http://thelifeyouwant.org/uploads/1/3/0/6/130622022/7281424.pdf
    • http://rxbbullies.com/uploads/1/3/0/5/130590177/1fce7b8c.pdf
    • http://bluffviewsale.proposals.jll.com/uploads/1/3/0/7/130776069/nemefaret.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007166.bin
553a78cdff33c92d9b96524c18172f43d1d0921b7f75fd5e29070535e7f0f9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 7600 bytes
font_01_sfnt_off00008f24.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F24 16036 bytes

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