Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e79521a3ecfc5a…

MALICIOUS

PDF

30.7 KB Created: 2020-05-15 10:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: ca977f061bee47a5bd26553a1e7e5c8a SHA-1: e55c8d0720d598717bde48c706447c95ca2beffe SHA-256: 64e79521a3ecfc5a9efc4298cc2891c6c7438ef80e687a98054adf0835d60e3f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains URLs that are also present in the extracted URL list, suggesting a coordinated effort to direct users to potentially harmful content. No scripts were extracted, but the sheer volume of external links points to a link farm or redirection scheme.

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://wetware.international/uploads/1/3/1/4/131452817/131452817.html#jashn+e+bahara+song++mr+jatt PDF link annotation
    • http://district1strong.com/uploads/1/3/1/0/131070847/duwifi.pdfIn PDF document text
    • http://bridesburgoc.com/uploads/1/3/0/2/130287937/384d38b760.pdfIn PDF document text
    • http://therapeuticessentails.com/uploads/1/3/0/5/130588185/woxowowilubaziger.pdfIn PDF document text
    • http://paulinefonzi.com/uploads/1/3/0/8/130814296/41c41.pdfIn PDF document text
    • http://pjscoupons.com/uploads/1/3/0/2/130287937/vapomiwuputawesove.pdfIn PDF document text
    • http://yummiesticecream.com/uploads/1/3/0/6/130620998/savefisevi.pdfIn PDF document text
    • http://americanteachersacademy.com/uploads/1/3/1/3/131398045/8006001.pdfIn PDF document text
    • http://thechicostumes.com/uploads/1/3/1/6/131637763/43c2ea2.pdfIn PDF document text
    • http://dckninternational.com/uploads/1/3/0/8/130813790/750233.pdfIn PDF document text
    • http://helloipx.com/uploads/1/3/0/8/130874146/ginenoziniru.pdfIn PDF document text
    • http://powerofyourintuition.com/uploads/1/3/0/5/130551239/44ffee833.pdfIn PDF document text
    • http://ns-synergyservices.com/uploads/1/3/0/3/130379575/wenilus_sitemubawimo_temimofif_nukodisomi.pdfIn PDF document text
    • http://connectedimpression.net/uploads/1/3/0/4/130477719/bofufesi.pdfIn PDF document text
    • http://biofouling.net/uploads/1/3/0/2/130272271/900648.pdfIn PDF document text
    • http://monkbars.com/uploads/1/3/1/4/131452886/2382667.pdfIn PDF document text
    • http://marketfb.net/uploads/1/3/0/5/130551124/nevekaba.pdfIn PDF document text
    • http://truckrepairstlouis.com/uploads/1/3/0/8/130874247/xasuxena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E32 9764 bytes
SHA-256: 6599899b501a1ad9250661e8a981926a45ccfcd4e42d7dffc7cc723636cd1375

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