Malicious PDF — malware analysis report

Static analysis result for SHA-256 21716d9c516aae31…

MALICIOUS

PDF

37.9 KB Created: 2020-03-22 07:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1864fd2a163c643ba6c3333969f2c65 SHA-1: 98778cc51ded1913144d8885327bee82ae354f84 SHA-256: 21716d9c516aae310dcd7d4a67803173380c913a96f30bd22736ccf5d53f81bf
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This suggests a link farm or redirection scheme designed to obscure the ultimate destination or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://marikacleaningservice.com/uploads/1/3/0/7/130776603/130776603.html#norma+oficial+mexicana+del+manejo+de+rpbi
    • http://yinyangyoga.xyz/uploads/1/3/0/6/130639486/9ab7e32fe2.pdf
    • http://newtampafootandankle.net/uploads/1/3/0/7/130739206/mozitokodukez.pdf
    • http://iowadetail.com/uploads/1/3/0/5/130590243/nuzinopabaraw.pdf
    • http://mail.peoplesmartworld.com/uploads/1/3/0/7/130739621/d0535fd53.pdf
    • http://dwyercontract.com/uploads/1/3/0/7/130775320/pipajodojewif.pdf
    • http://hostmaster.zionchristianretreat.org/uploads/1/3/0/7/130740465/fosigutosawejij_xepidizepa_xurojevuwozixew.pdf
    • http://riverrepublicproductions.com/uploads/1/3/0/7/130740340/8bc7f.pdf
    • http://www.flatrack-farms.com/uploads/1/3/0/7/130739895/sapepileparut-jesalajapis-milapaw.pdf
    • http://rezxtracts.com/uploads/1/3/0/2/130288540/fosiwagamuzene.pdf
    • http://www.grumpymonkstudios.net/uploads/1/3/0/4/130493037/0f18ebc2f92.pdf
    • http://impresorasdecarton.com.mx/uploads/1/3/0/6/130621570/7365845.pdf
    • http://cheltenhammarket.co.uk/uploads/1/3/0/4/130476208/2388231.pdf
    • http://askwiseguys.com/uploads/1/3/0/2/130270873/2686355.pdf
    • http://redribbonstaging.com/uploads/1/3/0/4/130436093/tufaj-wetezax-puxir-zurupa.pdf
    • http://drfunproductions.com/uploads/1/3/0/4/130476791/rudibexomub.pdf
    • http://elfredo.com/uploads/1/3/0/5/130539691/deb5ee16b2e977.pdf
    • http://abdieltinocophotography.com/uploads/1/3/0/3/130324326/rixobimamorid-xejovevi.pdf
    • http://corrinahoneycutt.com/uploads/1/3/0/4/130488839/226852.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_off00006ced.bin
d1fe90afa707d0ed2e484103caebc37b6cd7eca41424c5dfdf422be0f0bf5888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 7900 bytes

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