Malicious PDF — malware analysis report

Static analysis result for SHA-256 373fe79762f76096…

MALICIOUS

PDF

51.6 KB Created: 2020-04-12 10:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f3c90149f90d38a95ba991d351b4199 SHA-1: ca152ca11df74ca38452c9f706e9e7be4d57d62b SHA-256: 373fe79762f760960e7c1b59cf7d6784d3bbdf124d792506ffa57708f5fdbd96
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary purpose appears to be to create a link farm, likely for SEO manipulation or to distribute further malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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://kdmorano.com/uploads/1/3/0/6/130604522/130604522.html#fecula+de+maiz+formula+quimica
    • http://cleanmachineplus.com/uploads/1/3/1/4/131406947/cb944e6045.pdf
    • http://heightscornerrestaurant.com/uploads/1/3/0/6/130621190/1792839.pdf
    • http://dogncatdentistry.com/uploads/1/3/0/6/130621533/vejikinedexutaba.pdf
    • http://arkbattles.net/uploads/1/3/0/7/130739059/mepedimet_wodenezoso_porono.pdf
    • http://mccleansolutions.com/uploads/1/3/1/3/131380213/wetovemodupuku_lufotojasaxo.pdf
    • http://damcon.org/uploads/1/3/0/6/130640175/22ec6.pdf
    • http://75yrsofmargaret.com/uploads/1/3/0/4/130483489/45905cd.pdf
    • http://carnewhandypro.com/uploads/1/3/0/4/130435851/kewikava.pdf
    • http://businesssupportmanagement.com/uploads/1/3/0/3/130323675/fajirepitat.pdf
    • http://iamgeeze.com/uploads/1/3/0/8/130813714/6ba4cda.pdf
    • http://lecoindebetty.com/uploads/1/3/0/4/130476266/8512519.pdf
    • http://lecoindebetty.com/uploads/1/3/0/4/1
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e44.bin
9804bd1d73c32265fc434f50aef092922e394528cd59006a3291fe087a8cf710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E44 9796 bytes
font_01_sfnt_off0000a0e4.bin
b630bfe6dd19ec9a7f7939777e9becf22f1b3436fd30afb0c93f4e7bc1780beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E4 3028 bytes
font_02_sfnt_off0000ab8f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8F 16036 bytes

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