Malicious PDF — malware analysis report

Static analysis result for SHA-256 d786d16334ca6c77…

MALICIOUS

PDF

41.8 KB Created: 2020-04-07 12:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4458ff0860310b98a2f15ec3b0a7f39 SHA-1: 3f8270acbf4a5fe3480c89309e70392608b566a3 SHA-256: d786d16334ca6c7702b59c1cd6f62da2e6d138769ca071f3a7428ed4b44075c0
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body text is largely unreadable binary data, making it difficult to ascertain a more specific attack pattern beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://unique-security-solutions.com/uploads/1/3/1/3/131383748/131383748.html#todas+las+capas+de+la+tierra+internas+y+externas
    • http://convencionlatinaalanonalateen.com/uploads/1/3/1/4/131408371/mukejetazu-xigunugana.pdf
    • http://jacquelinereneking.com/uploads/1/3/0/2/130272877/tefafubu.pdf
    • http://fllopenlebanon.com/uploads/1/3/0/3/130313453/niguw-daxubofukalato-ketozif-julokug.pdf
    • http://donseverns.com/uploads/1/3/0/7/130739495/0d4d05bd06b591b.pdf
    • http://enmassepodcast.com/uploads/1/3/0/4/130476672/gerari-kagitija-pulevib-nofosepiwites.pdf
    • http://adstorank.com/uploads/1/3/0/2/130288883/e0c3d0d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fa.bin
2c9cfe4413374032834e550566e30d7d6f5d2cdeb75b490e72a3c01a11795ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 8432 bytes
font_01_sfnt_off0000837e.bin
48dc34574ad466b140e1cd652e666c68fc4f3c002b3b202410ec1bddaf17efe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837E 16100 bytes

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