Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceb3381c79efc7c…

MALICIOUS

PDF

43.1 KB Created: 2020-03-10 10:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32911df95f6130c2e292f4d02147dc43 SHA-1: cf67c28598c3670c5cf2b6d7af74e1476afdb958 SHA-256: 9ceb3381c79efc7c4a114e4ba6090e8822fc5d3dc83a59df78c8c0f4fad00172
94 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, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body mentions 'Ielts practice test plus 1 reading test 3', which is likely a lure to encourage users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports the conclusion that this document is designed to redirect users to potentially harmful 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://host238.carmichaelnl.com/uploads/1/3/0/5/130551971/130551971.html#ielts+practice+test+plus+1+reading+test+3
    • http://mapcounter.net/uploads/1/3/0/2/130272342/8240252.pdf
    • http://paradisepetsmag.com/uploads/1/3/0/6/130639751/muzetokix-tujibizek.pdf
    • http://hostmaster.soundboard.nyc/uploads/1/3/0/4/130483653/b7739969e05d76.pdf
    • http://buckhillcoffee.com/uploads/1/3/0/2/130271043/f8dcc891c7.pdf
    • http://angelsofmercyhomehealth.com/uploads/1/3/0/7/130739558/pulale.pdf
    • http://vanessanysten.com/uploads/1/3/0/5/130540116/kobifisok_letijarejotimo_nizifo_ruzepimuvok.pdf
    • http://myenterpriseinc.com/uploads/1/3/0/4/130488615/dafakaneweb_kijedirawuguz_zuwiponuwo.pdf
    • http://www.sportsman14.com/uploads/1/3/0/6/130639905/pawulolaxabod.pdf
    • http://samandabeschildcare.com/uploads/1/3/0/6/130603891/zumesugavisaxev.pdf
    • http://crowdergize.com/uploads/1/3/0/4/130483266/bc91bf6af18767f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd8.bin
12acba9b485baa546e634672601eee70aa63418c238a5c4a0d81b25ffc299a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD8 7248 bytes
font_01_sfnt_off00008a75.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 16036 bytes

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