Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd435604ca52d579…

MALICIOUS

PDF

111.4 KB Created: 2020-04-06 09:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0ef4e8de7aa7f1c8718ae060c094a0c SHA-1: c98744fdc8d8b30d6f6a1371fe74ad7e41ab119b SHA-256: dd435604ca52d5799d1c735fe44aff16015cd94b92af8b63716f0202a932b1a8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO link farms or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains text related to reading comprehension for third grade, which is likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://alexmcmichael.com/uploads/1/3/1/3/131379026/131379026.html#prueba+de+lectura+comprensiva+para+tercer+grado
    • http://daviddegennaro.com/uploads/1/3/0/6/130621324/minajolemukijibuvine.pdf
    • http://appliancerepairbolingbrookil.com/uploads/1/3/0/5/130588644/c751b.pdf
    • http://drmnapparel.com/uploads/1/3/0/5/130551463/tezibaniruti_zajaga_ruliwepimo.pdf
    • http://mikejamescalvert.com/uploads/1/3/0/6/130621470/xozituvira.pdf
    • http://austin-roofers.info/uploads/1/3/0/6/130621814/sufanazulukax-fekotojiduzix.pdf
    • http://fixyourteethnow.com/uploads/1/3/1/4/131482832/5182094.pdf
    • http://flamingotrading.com/uploads/1/3/0/8/130874360/vomujijixabamu.pdf
    • http://hamptonbaysyachtclub.com/uploads/1/3/0/9/130969204/bemujisosolab.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_off000182a5.bin
8f34790ca372a244dd359e5778934b35ca0a8d719aaa7544adcf30f4785af16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182A5 1632 bytes
font_01_sfnt_off00018a73.bin
81fefa4df3cc68fcae0a624decbbed045945bf7b0f9522828c9668a5ef47a7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A73 10092 bytes

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