Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c837c9f7695bc3…

MALICIOUS

PDF

36.3 KB Created: 2020-03-28 02:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: afc6ddb701b6881cec0f46b4bdc5f48d SHA-1: d61a3a44e7d93045d365f39ed9569d7b6b142f43 SHA-256: 53c837c9f7695bc31b4dfe3201a68c1924e47e8240c71655d58d1d9088a2b463
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body text is minimal and appears to be obfuscated or corrupted. The primary attack pattern observed is the distribution of a link farm, which could be used for SEO manipulation, phishing, or to host further malicious content. No scripts were extracted from this sample.

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://kylaconner.com/uploads/1/3/0/4/130435781/130435781.html#ejemplos+de+silabas+tonicas+agudas
    • http://innova-publicrelations.com/uploads/1/3/0/2/130291635/kumubegubepu.pdf
    • http://aguiarassessoria.com/uploads/1/3/0/7/130775644/516752.pdf
    • http://gam-anon-slo.alesiagriffin.net/uploads/1/3/0/7/130740427/zagogemapilikepejon.pdf
    • http://storehousene.org.uk/uploads/1/3/0/9/130969522/wumov-forunupup-simavojeg.pdf
    • http://blog.davidhildebrand.org/uploads/1/3/0/8/130874150/7071972.pdf
    • http://smcolife.com/uploads/1/3/0/8/130814145/fufikitelaxowi.pdf
    • http://jdsensei.com/uploads/1/3/1/1/131164387/cea0bc1933cd434.pdf
    • http://culturaenruta.com/uploads/1/3/0/3/130313612/vodenove-gapaziwozoxelo-julun-fevikirinunibif.pdf
    • http://mail.dmgatl.com/uploads/1/3/0/8/130813399/finekitige.pdf
    • http://ntsrfaqs.com/uploads/1/3/0/4/130476237/75f44237dfde.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_off0000651d.bin
fee5763f59356833e3ddc58b4e8433da6b0b4d6c1645bd5a784b725d308ceb8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 8188 bytes

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