Malicious PDF — malware analysis report

Static analysis result for SHA-256 7168bebc88651983…

MALICIOUS

PDF

45.3 KB Created: 2020-03-26 05:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 40139264bcb65599148e826f450bc03b SHA-1: 28c239edd5b1cebdd5ddb409164711b32ce76ef0 SHA-256: 7168bebc88651983823879a7716b2b3ee61db72daa45c0790b6afbb446b5c4db
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to obscure malicious activity. The document body, though corrupted, contains text suggesting a financial tool lure, which is likely a pretext to drive users to these malicious URLs. The ML classifier strongly indicates malicious intent.

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://meshayla.com/uploads/1/3/0/7/130776518/130776518.html#planilla+excel+para+calcular+van+y+tir
    • http://galhaur.com/uploads/1/3/0/4/130435962/werar.pdf
    • http://bajalife.com/uploads/1/3/0/5/130545885/xubugafuri.pdf
    • http://oneskylane.net/uploads/1/3/0/6/130604639/9454535.pdf
    • http://katdar.net/uploads/1/3/0/6/130639305/7855cf.pdf
    • http://calligraphy-corner.com/uploads/1/3/0/5/130588499/89f1288f28e98.pdf
    • http://airstreamflying-cloud19cb.net/uploads/1/3/0/4/130483303/nekemi.pdf
    • http://handtherapy.online/uploads/1/3/0/4/130483879/birugoxokitawal.pdf
    • http://eleancia.com/uploads/1/3/0/6/130621480/1336864.pdf
    • http://www.wareshoals.org/uploads/1/3/0/5/130543386/882a0a.pdf
    • http://juderus.com/uploads/1/3/0/5/130539718/fb0248ac29.pdf
    • http://controlbydesignsrq.com/uploads/1/3/0/2/130287445/niduguzofu.pdf
    • http://michaelsautodetailing.com/uploads/1/3/0/9/130969057/nemaroruwitulupadid.pdf
    • http://www.genevievewilson.co/uploads/1/3/0/6/130605432/2858497.pdf
    • http://gpdisigns.com/uploads/1/3/0/6/130604557/nupibibosanoveseguxo.pdf
    • http://madelynrosephoto.com/uploads/1/3/0/7/130776074/4f3f150f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a2.bin
dea9905100dce02b8bee5357025ae091013750f4dc0e2eddeccaef4ff492d55a
pdf-font-stream PDF embedded font (sfnt) at offset 0x68A2 8816 bytes
font_01_sfnt_off000088b7.bin
2e0d6281891bd9bd2719a61e260300a7d87bd62bfd1c80e29c658e39d626dd30
pdf-font-stream PDF embedded font (sfnt) at offset 0x88B7 2628 bytes
font_02_sfnt_off00009200.bin
40a403f8312ff9c93041e514e965a4d57d797ba541f1da729710ef172887bfc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9200 16060 bytes