Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd08e3f3620af30…

MALICIOUS

PDF

37.5 KB Created: 2020-06-15 21:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e1eca28da690e9afed7e1fda67d869e SHA-1: b976804f52e8ca510813f1cc91b3b7ea85b7455d SHA-256: 5fd08e3f3620af303d3307f8a5f610e5dcfe2b377682b86f1b61dc2d631c1577
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to attract search engine traffic. The document body and heuristics suggest a lure related to free file conversion, likely a pretext to direct users to malicious or phishing content hosted on these external domains. No scripts were extracted, but the extensive use of external URLs and the ML classifier's high confidence score support the malicious verdict.

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://mta-sts.mx.ttwinsmusik.com/uploads/1/3/0/7/130776113/130776113.html#free+download+converter+pdf+file+to+word+document
    • http://austins-restaurant.com/uploads/1/3/0/6/130620565/1474243.pdf
    • http://relx4u.com/uploads/1/3/0/5/130589366/e16a34a51.pdf
    • http://therileyrecruit.com/uploads/1/3/1/6/131637432/16d841e4.pdf
    • http://cpanel.confistreet.com/uploads/1/3/0/8/130873890/forano.pdf
    • http://gatewayblvd-sv.com/uploads/1/3/1/4/131453194/ladeniseto-futimoxebesozox-guboxixen.pdf
    • http://lebanonlandscaping.net/uploads/1/3/0/6/130639530/9eb55ee376.pdf
    • http://clouttrain.net/uploads/1/3/0/7/130775897/seraba.pdf
    • http://supercleanequipmentwash.com/uploads/1/3/1/8/131856376/0dcd685cae.pdf
    • http://construmexlimpieza.com/uploads/1/3/1/1/131163858/bimolugulisojat_duparesakuseto_kufubij_winijofulog.pdf
    • http://mta-sts.mx.lifeofpen.com/uploads/1/3/0/6/130604244/farod_mawigofofonopa_vofisenifesu_gewegok.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b5b.bin
cc1cc64d27dbeac021d96a483d9c92aa4779981f0ef057bea1ab552941ea44bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5B 18004 bytes

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