Malicious PDF — malware analysis report

Static analysis result for SHA-256 6356201ab96c5dbb…

MALICIOUS

PDF

28.8 KB Created: 2020-05-06 04:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b590b92dd3243d029dded66f352fd3bd SHA-1: d30cc4e9857f94c989bf68b45271fa02650a9826 SHA-256: 6356201ab96c5dbb4966e92d91b10eecb9cc1d791793e60855a89cfb6cf76ff2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded document body text and the numerous URLs suggest a campaign to manipulate search engine results or distribute further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://joyzwish.com/uploads/1/3/1/6/131636886/131636886.html#abas+ii+scoring+manual+pdf
    • http://rocketamusements.net/uploads/1/3/0/5/130538862/2402987.pdf
    • http://china-unlocked.com/uploads/1/3/0/6/130621301/mabogifefetowo-jasikod.pdf
    • http://lindentreephotos.net/uploads/1/3/0/4/130476180/8002099.pdf
    • http://youthnowfarm.ca/uploads/1/3/1/4/131483110/lawax_zipupudiduwo.pdf
    • http://colorado-hoa-law.com/uploads/1/3/0/5/130588225/168f07d85754983.pdf
    • http://thedomesticmarine-codetalkerseries.com/uploads/1/3/0/7/130739163/1085122.pdf
    • http://journeytojobs.com/uploads/1/3/1/3/131398045/8235033.pdf
    • http://diegocolucci.com/uploads/1/3/0/5/130538959/f8838defd.pdf
    • http://dandelmonte.org/uploads/1/3/0/9/130969623/rerugox.pdf
    • http://carriedavenport.net/uploads/1/3/0/7/130776889/gatatutuzolepududi.pdf
    • http://hunnybeecandles.com/uploads/1/3/1/4/131453215/4228068fc.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/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049dc.bin
e149b3fbf5a88271d5c58ee6e10e95026e09ea72cf8c603bddf72af43093e045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DC 9412 bytes

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