Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b552bc8dbff6aff…

MALICIOUS

PDF

36.8 KB Created: 2020-04-06 10:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 313cf049ecfcc1ef5200d9731422143c SHA-1: c15e039091312826c05bebc52e564bd605c63446 SHA-256: 3b552bc8dbff6aff33147990375ab08c8faa07bcb5cdde2320c18c29d665f256
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to further malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://slysit.com/uploads/1/3/0/7/130739198/130739198.html#retroalimentacion+positiva+y+negativa+hormonas
    • http://mhcustomhomes.com/uploads/1/3/1/1/131164034/4255030.pdf
    • http://prime-property-investments.com/uploads/1/3/0/6/130620343/bojofaxuwusijoz.pdf
    • http://empoweringyourmind.net/uploads/1/3/1/4/131409709/9337da1.pdf
    • http://threefoolscoffee.com/uploads/1/3/0/7/130740212/guratirimazidikasex.pdf
    • http://pearlstreetsalonandspa.com/uploads/1/3/0/5/130588700/a551e1.pdf
    • http://truwallsolutions.com/uploads/1/3/1/3/131380043/8187408.pdf
    • http://getvisatobrazil.com/uploads/1/3/0/5/130588786/3190290.pdf
    • http://gardenencounters.com/uploads/1/3/0/5/130590532/8158316.pdf
    • http://mail.cmro.net/uploads/1/3/1/3/131381497/247923.pdf
    • http://jemstreats.net/uploads/1/3/0/9/130969358/riwepejo.pdf
    • http://ubis.ca/uploads/1/3/0/2/130272458/65be9df263.pdf
    • http://freeshawnali.com/uploads/1/3/0/5/130551675/sesurem.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_off00006596.bin
41b6b43d7b863e26eec6d07ebda8fbce04bc1837c45471f5cb9b6f2053ac814b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6596 8476 bytes

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