Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5fd088e52cec6c…

MALICIOUS

PDF

35.7 KB Created: 2020-04-05 13:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e88c20d60ecc5079b2d6a16ed05ec471 SHA-1: d9728054717ffb2d809f17899cf323b3a3117e4b SHA-256: fb5fd088e52cec6cf013c08e62b07f17aef76c50eb3ed5ad405a638a972d6f6a
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious with high confidence. Static analysis revealed it functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains. The document body, though partially corrupted, contains text related to 'Preguntas de clima laboral' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure or distraction. The primary attack pattern involves directing users to these external links, which could host further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gianlucafiori.com/uploads/1/3/0/6/130621215/130621215.html#preguntas+de+clima+laboral
    • http://afrezzathepossibilities.com/uploads/1/3/0/7/130739470/wulufejedemeta.pdf
    • http://thrufeedcommunications.com/uploads/1/3/0/9/130969925/d49855d.pdf
    • http://luzoncateringservice.com/uploads/1/3/1/3/131380032/rafakupobomusaz-tiwigaf-befinuzukilo.pdf
    • http://kisservicing.com/uploads/1/3/0/2/130291463/8a7f1619a.pdf
    • http://legendsfemalesale.com/uploads/1/3/0/4/130476079/9534499.pdf
    • http://threeomg.com/uploads/1/3/0/5/130550901/5264825.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_off00006306.bin
f6d22c6137d307da3a60f1e333c8c47040dccfabf9871311abbe8daed5b78cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6306 8244 bytes

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